CVE-2026-33778 (GCVE-0-2026-33778)

Vulnerability from cvelistv5 – Published: 2026-04-09 21:35 – Updated: 2026-04-10 14:11
VLAI
Title
Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is received kmd/iked crashes
Summary
An Improper Validation of Syntactic Correctness of Input vulnerability in the IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS). If an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections. This issue affects Junos OS on SRX Series and MX Series: * all versions before 22.4R3-S9, * 23.2 version before 23.2R2-S6, * 23.4 version before 23.4R2-S7, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2-S3, * 25.2 versions before 25.2R1-S2, 25.2R2.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/RE:M
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-10 14:10 UTC
CWE
  • CWE-1286 - Improper Validation of Syntactic Correctness of Input
Assigner
juniper CNA under the mitre root
CNA scorecard B 84/100 over 193 records in the last 180 days details
References
URL Tags
https://kb.juniper.net/JSA107868 vendor-advisory
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Affected: 0 , < 22.4R3-S9 (semver)
Affected: 23.2 , < 23.2R2-S6 (semver)
Affected: 23.4 , < 23.4R2-S7 (semver)
Affected: 24.2 , < 24.2R2-S4 (semver)
Affected: 24.4 , < 24.4R2-S3 (semver)
Affected: 25.2 , < 25.2R1-S2, 25.2R2 (semver)
guessed Create a notification for this product.
Date Public
2026-04-08 16:00
Show details on NVD website
To clipboard 

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                  "value": "An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\u003cbr\u003e\u003cbr\u003eIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects Junos OS on \n\nSRX Series and MX Series:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eall versions before 22.4R3-S9,\u003c/li\u003e\u003cli\u003e23.2 version before 23.2R2-S6,\u003c/li\u003e\u003cli\u003e23.4 version before 23.4R2-S7,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S4,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S3,\u003c/li\u003e\u003cli\u003e25.2 versions before 25.2R1-S2, 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003cbr\u003e\u003c/p\u003e"
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              ],
              "value": "An Improper Validation of Syntactic Correctness of Input vulnerability in the  IPsec library used by kmd and iked of Juniper Networks Junos OS on SRX Series and MX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).\n\nIf an affected device receives a specifically malformed first ISAKMP packet from the initiator, the kmd/iked process will crash and restart, which momentarily prevents new security associations (SAs) for from being established. Repeated exploitation of this vulnerability causes a complete inability to establish new VPN connections.\n\nThis issue affects Junos OS on \n\nSRX Series and MX Series:\n\n\n\n  *  all versions before 22.4R3-S9,\n  *  23.2 version before 23.2R2-S6,\n  *  23.4 version before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S4,\n  *  24.4 versions before 24.4R2-S3,\n  *  25.2 versions before 25.2R1-S2, 25.2R2."
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          ],
          "exploits": [
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          "metrics": [
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                "confidentialityImpact": "NONE",
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                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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                "valueDensity": "NOT_DEFINED",
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                "vulnerabilityResponseEffort": "MODERATE"
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            }
          ],
          "problemTypes": [
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              "descriptions": [
                {
                  "cweId": "CWE-1286",
                  "description": "CWE-1286 Improper Validation of Syntactic Correctness of Input",
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                  "type": "CWE"
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          "providerMetadata": {
            "dateUpdated": "2026-04-09T21:35:10.585Z",
            "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
            "shortName": "juniper"
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          "references": [
            {
              "tags": [
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              "url": "https://kb.juniper.net/JSA107868"
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          ],
          "solutions": [
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              "supportingMedia": [
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                  "base64": false,
                  "type": "text/html",
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              "value": "The following software releases have been updated to resolve this specific issue: 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S4, 24.4R2-S3, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases."
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          "source": {
            "advisory": "JSA107868",
            "defect": [
              "1909025"
            ],
            "discovery": "USER"
          },
          "title": "Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is received kmd/iked crashes",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
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        "assignerShortName": "juniper",
        "cveId": "CVE-2026-33778",
        "datePublished": "2026-04-09T21:35:10.585Z",
        "dateReserved": "2026-03-23T19:46:13.669Z",
        "dateUpdated": "2026-04-10T14:11:42.844Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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