Common Weakness Enumeration

CWE-755

Discouraged

Improper Handling of Exceptional Conditions

Abstraction: Class · Status: Incomplete

The product does not handle or incorrectly handles an exceptional condition.

739 vulnerabilities reference this CWE, most recent first.

GHSA-6V6C-5W6V-23MC

Vulnerability from github – Published: 2022-05-24 16:58 – Updated: 2024-04-04 02:18
VLAI
Details

An elevation of privilege vulnerability exists when Windows Error Reporting manager improperly handles a process crash, aka 'Windows Error Reporting Manager Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-1315, CVE-2019-1339.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2019-1342"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-10-10T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "An elevation of privilege vulnerability exists when Windows Error Reporting manager improperly handles a process crash, aka \u0027Windows Error Reporting Manager Elevation of Privilege Vulnerability\u0027. This CVE ID is unique from CVE-2019-1315, CVE-2019-1339.",
  "id": "GHSA-6v6c-5w6v-23mc",
  "modified": "2024-04-04T02:18:34Z",
  "published": "2022-05-24T16:58:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-1342"
    },
    {
      "type": "WEB",
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1342"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-6VWM-P7VV-6MCX

Vulnerability from github – Published: 2022-05-24 17:15 – Updated: 2022-07-11 00:00
VLAI
Details

An issue was discovered on LG mobile devices with Android OS 8.0, 8.1, 9.0, and 10.0 (MTK chipsets) software. The MTK kernel does not properly implement exception handling, allowing an attacker to gain privileges. The LG ID is LVE-SMP-200001 (February 2020).

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2020-11875"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-04-17T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered on LG mobile devices with Android OS 8.0, 8.1, 9.0, and 10.0 (MTK chipsets) software. The MTK kernel does not properly implement exception handling, allowing an attacker to gain privileges. The LG ID is LVE-SMP-200001 (February 2020).",
  "id": "GHSA-6vwm-p7vv-6mcx",
  "modified": "2022-07-11T00:00:25Z",
  "published": "2022-05-24T17:15:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-11875"
    },
    {
      "type": "WEB",
      "url": "https://cwe.mitre.org/data/definitions/755.html"
    },
    {
      "type": "WEB",
      "url": "https://lgsecurity.lge.com"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-6W3V-8X64-R348

Vulnerability from github – Published: 2024-04-12 15:37 – Updated: 2025-05-19 12:30
VLAI
Details

An Improper Handling of Exceptional Conditions vulnerability in the Class of Service daemon (cosd) of Juniper Networks Junos OS on MX Series allows an authenticated, network-based attacker with low privileges to cause a limited Denial of Service (DoS).

In a scaled subscriber scenario when specific low privileged commands, received over NETCONF, SSH or telnet, are handled by cosd on behalf of mgd, the respective child management daemon (mgd) processes will get stuck. In case of (Netconf over) SSH this leads to stuck SSH sessions, so that when the connection-limit for SSH is reached new sessions can't be established anymore. A similar behavior will be seen for telnet etc.

Stuck mgd processes can be monitored by executing the following command:

user@host> show system processes extensive | match mgd | match sbwait

This issue affects Juniper Networks Junos OS on MX Series: All versions earlier than 20.4R3-S9; 21.2 versions earlier than 21.2R3-S7; 21.3 versions earlier than 21.3R3-S5; 21.4 versions earlier than 21.4R3-S5; 22.1 versions earlier than 22.1R3-S4; 22.2 versions earlier than 22.2R3-S3; 22.3 versions earlier than 22.3R3-S2; 22.4 versions earlier than 22.4R3; 23.2 versions earlier than 23.2R1-S2, 23.2R2.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-21610"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-12T15:15:23Z",
    "severity": "MODERATE"
  },
  "details": "An Improper Handling of Exceptional Conditions vulnerability in the Class of Service daemon (cosd) of Juniper Networks Junos OS on MX Series allows an authenticated, network-based attacker with low privileges to cause a limited Denial of Service (DoS).\n\nIn a scaled subscriber scenario when specific low privileged commands, received over NETCONF, SSH or telnet, are handled by cosd on behalf of mgd, the respective child management daemon (mgd) processes will get stuck. In case of (Netconf over) SSH this leads to stuck SSH sessions, so that when the connection-limit for SSH is reached new sessions can\u0027t be established anymore. A similar behavior will be seen for telnet etc.\n\nStuck mgd processes can be monitored by executing the following command:\n\n\u00a0 user@host\u003e show system processes extensive | match mgd | match sbwait\n\nThis issue affects Juniper Networks Junos OS on MX Series:\nAll versions earlier than 20.4R3-S9;\n21.2 versions earlier than 21.2R3-S7;\n21.3 versions earlier than 21.3R3-S5;\n21.4 versions earlier than 21.4R3-S5;\n22.1 versions earlier than 22.1R3-S4;\n22.2 versions earlier than 22.2R3-S3;\n22.3 versions earlier than 22.3R3-S2;\n22.4 versions earlier than 22.4R3;\n23.2 versions earlier than 23.2R1-S2, 23.2R2.",
  "id": "GHSA-6w3v-8x64-r348",
  "modified": "2025-05-19T12:30:33Z",
  "published": "2024-04-12T15:37:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-21610"
    },
    {
      "type": "WEB",
      "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
    },
    {
      "type": "WEB",
      "url": "http://supportportal.juniper.net/JSA75751"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-72R7-J93F-VRW2

Vulnerability from github – Published: 2023-06-06 00:30 – Updated: 2024-04-04 04:32
VLAI
Details

On the affected platforms running EOS, a malformed DHCP packet might cause the DHCP relay agent to restart.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2023-24510"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-06-05T22:15:11Z",
    "severity": "HIGH"
  },
  "details": "On the affected platforms running EOS, a malformed DHCP packet might cause the DHCP relay agent to restart.",
  "id": "GHSA-72r7-j93f-vrw2",
  "modified": "2024-04-04T04:32:33Z",
  "published": "2023-06-06T00:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-24510"
    },
    {
      "type": "WEB",
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/17445-security-advisory-0087"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-7369-45QW-88C2

Vulnerability from github – Published: 2022-05-24 17:29 – Updated: 2022-05-24 17:29
VLAI
Details

An information leak was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. Handling of actor ID does not necessarily use the correct database or correct wiki.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2020-25869"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755",
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-09-27T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "An information leak was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. Handling of actor ID does not necessarily use the correct database or correct wiki.",
  "id": "GHSA-7369-45qw-88c2",
  "modified": "2022-05-24T17:29:43Z",
  "published": "2022-05-24T17:29:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25869"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6"
    },
    {
      "type": "WEB",
      "url": "https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.html"
    },
    {
      "type": "WEB",
      "url": "https://phabricator.wikimedia.org/T260485"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-74RW-PW87-V75G

Vulnerability from github – Published: 2022-09-07 00:01 – Updated: 2024-03-21 03:34
VLAI
Details

** UNSUPPORTED WHEN ASSIGNED ** sys/netinet/tcp_timer.h in FreeBSD before 7.0 contains a denial-of-service (DoS) vulnerability due to improper handling of TSopt on TCP connections. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2022-32264"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-09-06T18:15:00Z",
    "severity": "HIGH"
  },
  "details": "** UNSUPPORTED WHEN ASSIGNED ** sys/netinet/tcp_timer.h in FreeBSD before 7.0 contains a denial-of-service (DoS) vulnerability due to improper handling of TSopt on TCP connections. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.",
  "id": "GHSA-74rw-pw87-v75g",
  "modified": "2024-03-21T03:34:18Z",
  "published": "2022-09-07T00:01:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-32264"
    },
    {
      "type": "WEB",
      "url": "https://cgit.freebsd.org/src/commit/?id=4dc630cdd2f7a790604d2724ecb19c6aa95130a7"
    },
    {
      "type": "WEB",
      "url": "http://jvn.jp/en/jp/JVN20930118"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-74W3-63XV-X9MV

Vulnerability from github – Published: 2026-10-16 19:26 – Updated: 2026-10-16 19:26
VLAI
Summary
CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin
Details

Summary

A network DNS client allowed to request AXFR for a CoreDNS zone can trigger a panic when CoreDNS is configured with k8s_external headless-service zone transfers and Kubernetes contains a headless service endpoint with no declared ports. The built-in k8s_external transferer can emit an empty []dns.RR batch, and the shared transfer plugin indexes records[0] without checking that the batch is non-empty. In normal CoreDNS mode the panic is recovered and returned as SERVFAIL, but repeated triggering can disrupt requests and amplify panic logging; if the debug plugin disables recovery, the same path can crash the CoreDNS process.

Details

plugin/transfer/transfer.go assumes that every Transferer emits only non-empty []dns.RR batches. During AXFR/IXFR response generation it indexes records[0] without checking the slice length:

  • plugin/transfer/transfer.go:129-131
for records := range pchan {
    if x, ok := records[0].(*dns.SOA); ok && soa == nil {
        soa = x
    }

The built-in k8s_external transferer violates that contract for headless services whose endpoints have no declared ports. plugin/k8s_external/transfer.go sends the SRV result slice unconditionally:

  • plugin/k8s_external/transfer.go:104-106
recs, _ := e.srv(ctx, svcs, s)
ch <- recs

plugin/k8s_external/msg_to_dns.go intentionally skips services whose port is -1:

  • plugin/k8s_external/msg_to_dns.go:107-112
for _, s := range services {
    // Don't add the entry if the port is -1 (invalid). The kubernetes plugin uses port -1 when a service/endpoint
    // does not have any declared ports.
    if s.Port == -1 {
        continue
    }

The Kubernetes EndpointSlice conversion creates that sentinel when an EndpointSlice has no ports:

  • plugin/kubernetes/object/endpoint.go:62-66
if len(ends.Ports) == 0 {
    // Add sentinel if there are no ports.
    e.Subsets[0].Ports = []EndpointPort{{Port: -1}}

This creates a built-in source-to-sink chain:

  1. Kubernetes EndpointSlice has ready addresses and no ports.
  2. CoreDNS kubernetes converts it to an endpoint with Port: -1.
  3. k8s_external with headless includes that service in transfer data.
  4. k8s_external.Transfer sends an empty SRV []dns.RR batch.
  5. transfer.ServeDNS indexes records[0] and panics.

Suggested remediation:

  1. In plugin/transfer/transfer.go, skip or reject empty records batches before indexing records[0].
  2. In plugin/k8s_external/transfer.go, only send recs when len(recs) > 0 in the headless endpoint and port/protocol paths.
  3. Add regression tests covering Port: -1 headless services and empty transfer batches.

Example consumer-side guard:

for records := range pchan {
    if len(records) == 0 {
        continue
    }
    if x, ok := records[0].(*dns.SOA); ok && soa == nil {
        soa = x
    }
    ...
}

PoC

Safe local unit-level reproduction was performed. It does not contact external infrastructure and does not require a live Kubernetes cluster.

Reproducer A: the transfer sink panics on an empty batch

A temporary package test was added under plugin/transfer:

package transfer

import (
    "context"
    "fmt"
    "testing"

    "github.com/coredns/coredns/plugin/pkg/dnstest"
    "github.com/coredns/coredns/plugin/test"

    "github.com/miekg/dns"
)

type auditEmptyBatchTransferer struct{}

func (auditEmptyBatchTransferer) Transfer(zone string, serial uint32) (<-chan []dns.RR, error) {
    if zone != "example.org." {
        return nil, ErrNotAuthoritative
    }
    ch := make(chan []dns.RR, 3)
    ch <- []dns.RR{test.SOA(fmt.Sprintf("%s 100 IN SOA ns.dns.%s hostmaster.%s %d 7200 1800 86400 100", zone, zone, zone, 1))}
    ch <- []dns.RR{}
    close(ch)
    return ch, nil
}

func TestAuditEmptyTransferBatchPanics(t *testing.T) {
    tr := &Transfer{
        Transferers: []Transferer{auditEmptyBatchTransferer{}},
        xfrs:        []*xfr{{Zones: []string{"example.org."}, to: []string{"*"}}},
    }

    req := new(dns.Msg)
    req.SetQuestion("example.org.", dns.TypeAXFR)
    rec := dnstest.NewRecorder(&test.ResponseWriter{TCP: true})

    defer func() {
        if rec := recover(); rec == nil {
            t.Fatal("expected empty transfer batch to panic")
        }
    }()

    _, _ = tr.ServeDNS(context.Background(), rec, req)
}

Verification command and result:

$ go test ./plugin/transfer -run TestAuditEmptyTransferBatchPanics -count=1 -v
=== RUN   TestAuditEmptyTransferBatchPanics
--- PASS: TestAuditEmptyTransferBatchPanics (0.00s)
PASS
ok      github.com/coredns/coredns/plugin/transfer  0.005s

Reproducer B: the built-in k8s_external transferer emits the empty batch

A temporary package test was added under plugin/k8s_external:

package external

import (
    "testing"
    "time"

    "github.com/coredns/coredns/plugin/etcd/msg"
    "github.com/coredns/coredns/plugin/kubernetes"
    "github.com/coredns/coredns/request"

    "github.com/miekg/dns"
)

func TestAuditHeadlessNoPortTransferEmitsEmptyBatch(t *testing.T) {
    e := New()
    e.Zones = []string{"example.com."}
    e.headless = true
    e.externalAddrFunc = func(request.Request, bool) []dns.RR { return nil }
    e.externalSerialFunc = func(string) uint32 { return 1 }
    e.externalServicesFunc = func(string, bool) ([]msg.Service, map[string][]msg.Service) {
        return nil, map[string][]msg.Service{
            "/coredns/com/example/testns/headless/" + kubernetes.Endpoint: {{Host: "192.0.2.10", Port: -1, TTL: 5, Key: "/coredns/com/example/testns/headless/endpoint-a"}},
        }
    }

    ch, err := e.Transfer("example.com.", 0)
    if err != nil {
        t.Fatalf("Transfer returned error: %v", err)
    }

    deadline := time.After(time.Second)
    for {
        select {
        case batch, ok := <-ch:
            if !ok {
                t.Fatal("transfer closed before emitting an empty batch")
            }
            if len(batch) == 0 {
                return
            }
        case <-deadline:
            t.Fatal("timed out waiting for an empty batch")
        }
    }
}

Verification command and result:

$ go test ./plugin/k8s_external -run TestAuditHeadlessNoPortTransferEmitsEmptyBatch -count=1 -v
=== RUN   TestAuditHeadlessNoPortTransferEmitsEmptyBatch
--- PASS: TestAuditHeadlessNoPortTransferEmitsEmptyBatch (0.00s)
PASS
ok      github.com/coredns/coredns/plugin/k8s_external  0.012s

Additional focused verification:

$ go test ./plugin/transfer ./plugin/k8s_external ./plugin/kubernetes -run 'TestAudit|^$' -count=1 -v
ok      github.com/coredns/coredns/plugin/transfer  0.006s
ok      github.com/coredns/coredns/plugin/k8s_external  0.013s
ok      github.com/coredns/coredns/plugin/kubernetes    0.116s

Affected package suites:

$ go test ./plugin/transfer ./plugin/k8s_external ./plugin/kubernetes -count=1
ok      github.com/coredns/coredns/plugin/transfer  0.010s
ok      github.com/coredns/coredns/plugin/k8s_external  0.011s
ok      github.com/coredns/coredns/plugin/kubernetes    0.194s

Impact

A network client allowed to request AXFR for the affected zone can trigger a panic in CoreDNS when all prerequisites are present.

Required configuration/state:

example.com:53 {
    kubernetes cluster.local
    k8s_external example.com {
        headless
    }
    transfer example.com {
        to *
    }
}

Additional prerequisite:

  • The Kubernetes API state contains a headless-service endpoint represented by an EndpointSlice with ready addresses and no ports, producing CoreDNS msg.Service{Port: -1}.

In normal CoreDNS mode, core/dnsserver/server.go:267-279 recovers the panic and returns SERVFAIL, so this is a request-level availability issue and panic/log amplification issue. If the debug plugin is enabled, the server disables the recovery path and this can crash the CoreDNS process.

Show details on source website

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.14.4"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/coredns/coredns"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.9.4"
            },
            {
              "fixed": "1.14.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-62994"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-248",
      "CWE-755"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-16T19:26:42Z",
    "nvd_published_at": "2026-07-16T20:16:47Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nA network DNS client allowed to request AXFR for a CoreDNS zone can trigger a panic when CoreDNS is configured with `k8s_external` headless-service zone transfers and Kubernetes contains a headless service endpoint with no declared ports. The built-in `k8s_external` transferer can emit an empty `[]dns.RR` batch, and the shared `transfer` plugin indexes `records[0]` without checking that the batch is non-empty. In normal CoreDNS mode the panic is recovered and returned as `SERVFAIL`, but repeated triggering can disrupt requests and amplify panic logging; if the `debug` plugin disables recovery, the same path can crash the CoreDNS process.\n\n### Details\n\n`plugin/transfer/transfer.go` assumes that every `Transferer` emits only non-empty `[]dns.RR` batches. During AXFR/IXFR response generation it indexes `records[0]` without checking the slice length:\n\n- `plugin/transfer/transfer.go:129-131`\n\n```go\nfor records := range pchan {\n    if x, ok := records[0].(*dns.SOA); ok \u0026\u0026 soa == nil {\n        soa = x\n    }\n```\n\nThe built-in `k8s_external` transferer violates that contract for headless services whose endpoints have no declared ports. `plugin/k8s_external/transfer.go` sends the SRV result slice unconditionally:\n\n- `plugin/k8s_external/transfer.go:104-106`\n\n```go\nrecs, _ := e.srv(ctx, svcs, s)\nch \u003c- recs\n```\n\n`plugin/k8s_external/msg_to_dns.go` intentionally skips services whose port is `-1`:\n\n- `plugin/k8s_external/msg_to_dns.go:107-112`\n\n```go\nfor _, s := range services {\n    // Don\u0027t add the entry if the port is -1 (invalid). The kubernetes plugin uses port -1 when a service/endpoint\n    // does not have any declared ports.\n    if s.Port == -1 {\n        continue\n    }\n```\n\nThe Kubernetes EndpointSlice conversion creates that sentinel when an EndpointSlice has no ports:\n\n- `plugin/kubernetes/object/endpoint.go:62-66`\n\n```go\nif len(ends.Ports) == 0 {\n    // Add sentinel if there are no ports.\n    e.Subsets[0].Ports = []EndpointPort{{Port: -1}}\n```\n\nThis creates a built-in source-to-sink chain:\n\n1. Kubernetes EndpointSlice has ready addresses and no ports.\n2. CoreDNS `kubernetes` converts it to an endpoint with `Port: -1`.\n3. `k8s_external` with `headless` includes that service in transfer data.\n4. `k8s_external.Transfer` sends an empty SRV `[]dns.RR` batch.\n5. `transfer.ServeDNS` indexes `records[0]` and panics.\n\nSuggested remediation:\n\n1. In `plugin/transfer/transfer.go`, skip or reject empty `records` batches before indexing `records[0]`.\n2. In `plugin/k8s_external/transfer.go`, only send `recs` when `len(recs) \u003e 0` in the headless endpoint and port/protocol paths.\n3. Add regression tests covering `Port: -1` headless services and empty transfer batches.\n\nExample consumer-side guard:\n\n```go\nfor records := range pchan {\n    if len(records) == 0 {\n        continue\n    }\n    if x, ok := records[0].(*dns.SOA); ok \u0026\u0026 soa == nil {\n        soa = x\n    }\n    ...\n}\n```\n\n### PoC\n\nSafe local unit-level reproduction was performed. It does not contact external infrastructure and does not require a live Kubernetes cluster.\n\n#### Reproducer A: the `transfer` sink panics on an empty batch\n\nA temporary package test was added under `plugin/transfer`:\n\n```go\npackage transfer\n\nimport (\n    \"context\"\n    \"fmt\"\n    \"testing\"\n\n    \"github.com/coredns/coredns/plugin/pkg/dnstest\"\n    \"github.com/coredns/coredns/plugin/test\"\n\n    \"github.com/miekg/dns\"\n)\n\ntype auditEmptyBatchTransferer struct{}\n\nfunc (auditEmptyBatchTransferer) Transfer(zone string, serial uint32) (\u003c-chan []dns.RR, error) {\n    if zone != \"example.org.\" {\n        return nil, ErrNotAuthoritative\n    }\n    ch := make(chan []dns.RR, 3)\n    ch \u003c- []dns.RR{test.SOA(fmt.Sprintf(\"%s 100 IN SOA ns.dns.%s hostmaster.%s %d 7200 1800 86400 100\", zone, zone, zone, 1))}\n    ch \u003c- []dns.RR{}\n    close(ch)\n    return ch, nil\n}\n\nfunc TestAuditEmptyTransferBatchPanics(t *testing.T) {\n    tr := \u0026Transfer{\n        Transferers: []Transferer{auditEmptyBatchTransferer{}},\n        xfrs:        []*xfr{{Zones: []string{\"example.org.\"}, to: []string{\"*\"}}},\n    }\n\n    req := new(dns.Msg)\n    req.SetQuestion(\"example.org.\", dns.TypeAXFR)\n    rec := dnstest.NewRecorder(\u0026test.ResponseWriter{TCP: true})\n\n    defer func() {\n        if rec := recover(); rec == nil {\n            t.Fatal(\"expected empty transfer batch to panic\")\n        }\n    }()\n\n    _, _ = tr.ServeDNS(context.Background(), rec, req)\n}\n```\n\nVerification command and result:\n\n```text\n$ go test ./plugin/transfer -run TestAuditEmptyTransferBatchPanics -count=1 -v\n=== RUN   TestAuditEmptyTransferBatchPanics\n--- PASS: TestAuditEmptyTransferBatchPanics (0.00s)\nPASS\nok  \tgithub.com/coredns/coredns/plugin/transfer\t0.005s\n```\n\n#### Reproducer B: the built-in `k8s_external` transferer emits the empty batch\n\nA temporary package test was added under `plugin/k8s_external`:\n\n```go\npackage external\n\nimport (\n    \"testing\"\n    \"time\"\n\n    \"github.com/coredns/coredns/plugin/etcd/msg\"\n    \"github.com/coredns/coredns/plugin/kubernetes\"\n    \"github.com/coredns/coredns/request\"\n\n    \"github.com/miekg/dns\"\n)\n\nfunc TestAuditHeadlessNoPortTransferEmitsEmptyBatch(t *testing.T) {\n    e := New()\n    e.Zones = []string{\"example.com.\"}\n    e.headless = true\n    e.externalAddrFunc = func(request.Request, bool) []dns.RR { return nil }\n    e.externalSerialFunc = func(string) uint32 { return 1 }\n    e.externalServicesFunc = func(string, bool) ([]msg.Service, map[string][]msg.Service) {\n        return nil, map[string][]msg.Service{\n            \"/coredns/com/example/testns/headless/\" + kubernetes.Endpoint: {{Host: \"192.0.2.10\", Port: -1, TTL: 5, Key: \"/coredns/com/example/testns/headless/endpoint-a\"}},\n        }\n    }\n\n    ch, err := e.Transfer(\"example.com.\", 0)\n    if err != nil {\n        t.Fatalf(\"Transfer returned error: %v\", err)\n    }\n\n    deadline := time.After(time.Second)\n    for {\n        select {\n        case batch, ok := \u003c-ch:\n            if !ok {\n                t.Fatal(\"transfer closed before emitting an empty batch\")\n            }\n            if len(batch) == 0 {\n                return\n            }\n        case \u003c-deadline:\n            t.Fatal(\"timed out waiting for an empty batch\")\n        }\n    }\n}\n```\n\nVerification command and result:\n\n```text\n$ go test ./plugin/k8s_external -run TestAuditHeadlessNoPortTransferEmitsEmptyBatch -count=1 -v\n=== RUN   TestAuditHeadlessNoPortTransferEmitsEmptyBatch\n--- PASS: TestAuditHeadlessNoPortTransferEmitsEmptyBatch (0.00s)\nPASS\nok  \tgithub.com/coredns/coredns/plugin/k8s_external\t0.012s\n```\n\nAdditional focused verification:\n\n```text\n$ go test ./plugin/transfer ./plugin/k8s_external ./plugin/kubernetes -run \u0027TestAudit|^$\u0027 -count=1 -v\nok  \tgithub.com/coredns/coredns/plugin/transfer\t0.006s\nok  \tgithub.com/coredns/coredns/plugin/k8s_external\t0.013s\nok  \tgithub.com/coredns/coredns/plugin/kubernetes\t0.116s\n```\n\nAffected package suites:\n\n```text\n$ go test ./plugin/transfer ./plugin/k8s_external ./plugin/kubernetes -count=1\nok  \tgithub.com/coredns/coredns/plugin/transfer\t0.010s\nok  \tgithub.com/coredns/coredns/plugin/k8s_external\t0.011s\nok  \tgithub.com/coredns/coredns/plugin/kubernetes\t0.194s\n```\n\n### Impact\n\nA network client allowed to request AXFR for the affected zone can trigger a panic in CoreDNS when all prerequisites are present.\n\nRequired configuration/state:\n\n```corefile\nexample.com:53 {\n    kubernetes cluster.local\n    k8s_external example.com {\n        headless\n    }\n    transfer example.com {\n        to *\n    }\n}\n```\n\nAdditional prerequisite:\n\n- The Kubernetes API state contains a headless-service endpoint represented by an EndpointSlice with ready addresses and no ports, producing CoreDNS `msg.Service{Port: -1}`.\n\nIn normal CoreDNS mode, `core/dnsserver/server.go:267-279` recovers the panic and returns `SERVFAIL`, so this is a request-level availability issue and panic/log amplification issue. If the `debug` plugin is enabled, the server disables the recovery path and this can crash the CoreDNS process.",
  "id": "GHSA-74w3-63xv-x9mv",
  "modified": "2026-10-16T19:26:42Z",
  "published": "2026-10-16T19:26:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-74w3-63xv-x9mv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62994"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/pull/8207"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/commit/ab318db7b4a3a19273852ed627f54888198c8efb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/coredns/coredns"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/releases/tag/v1.14.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CoreDNS `k8s_external` headless AXFR can emit an empty transfer batch that panics the `transfer` plugin"
}

GHSA-758V-5G69-M4M5

Vulnerability from github – Published: 2022-05-24 17:00 – Updated: 2022-05-24 17:00
VLAI
Details

Unhandled exception in firmware for Intel(R) Ethernet 700 Series Controllers before version 7.0 may allow an authenticated user to potentially enable a denial of service via local access.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2019-0144"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2019-11-14T19:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Unhandled exception in firmware for Intel(R) Ethernet 700 Series Controllers before version 7.0 may allow an authenticated user to potentially enable a denial of service via local access.",
  "id": "GHSA-758v-5g69-m4m5",
  "modified": "2022-05-24T17:00:54Z",
  "published": "2022-05-24T17:00:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-0144"
    },
    {
      "type": "WEB",
      "url": "https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00255.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-77MV-HM7R-PR35

Vulnerability from github – Published: 2022-05-13 01:44 – Updated: 2022-05-13 01:44
VLAI
Details

Huawei smart phones LYO-L21 with software LYO-L21C479B107, LYO-L21C479B107 have a privilege escalation vulnerability. An authenticated, local attacker can crafts malformed packets after tricking a user to install a malicious application and exploit this vulnerability when in the exception handling process. Successful exploitation may cause the attacker to obtain a higher privilege of the smart phones.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2017-17172"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-06-14T14:29:00Z",
    "severity": "HIGH"
  },
  "details": "Huawei smart phones LYO-L21 with software LYO-L21C479B107, LYO-L21C479B107 have a privilege escalation vulnerability. An authenticated, local attacker can crafts malformed packets after tricking a user to install a malicious application and exploit this vulnerability when in the exception handling process. Successful exploitation may cause the attacker to obtain a higher privilege of the smart phones.",
  "id": "GHSA-77mv-hm7r-pr35",
  "modified": "2022-05-13T01:44:19Z",
  "published": "2022-05-13T01:44:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-17172"
    },
    {
      "type": "WEB",
      "url": "http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20180613-01-smartphone-en"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-77QF-9J4M-PH58

Vulnerability from github – Published: 2026-07-24 12:30 – Updated: 2026-09-10 18:31
VLAI
Details

A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2026-16730"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-755"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-24T12:16:47Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.",
  "id": "GHSA-77qf-9j4m-ph58",
  "modified": "2026-09-10T18:31:20Z",
  "published": "2026-07-24T12:30:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16730"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bus1/dbus-broker/issues/435"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:61340"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:61355"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:66018"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-16730"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506348"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.