CVE-2016-1546 (GCVE-0-2016-1546)

Vulnerability from cvelistv5 – Published: 2016-07-06 14:00 – Updated: 2024-08-05 23:02
VLAI
Summary
The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows.
Severity
5.9 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • n/a
Assigner
References
URL Tags
http://www.securityfocus.com/bid/92331 vdb-entryx_refsource_BID
http://httpd.apache.org/security/vulnerabilities_… x_refsource_CONFIRM
https://security.gentoo.org/glsa/201610-02 vendor-advisoryx_refsource_GENTOO
https://access.redhat.com/errata/RHSA-2017:1161 vendor-advisoryx_refsource_REDHAT
http://www.oracle.com/technetwork/security-adviso… x_refsource_CONFIRM
http://www.apache.org/dist/httpd/CHANGES_2.4 x_refsource_CONFIRM
http://svn.apache.org/viewvc?view=revision&revisi… x_refsource_CONFIRM
http://www.oracle.com/technetwork/topics/security… x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2018060… x_refsource_CONFIRM
https://lists.apache.org/thread.html/56c2e7cc9deb… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/84a3714f0878… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd18c3c43602… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/re3d27b6250a… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf6449464fd8… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rc998b18880d… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/re1e3a24664d… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r04e89e873d5… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9f93cf6dde3… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rcc44594d4d6… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb14daf9cc4e… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r76142b8c511… mailing-listx_refsource_MLIST
Date Public
2016-04-11 00:00
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  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2016-1546",
    "datePublished": "2016-07-06T14:00:00.000Z",
    "dateReserved": "2016-01-07T00:00:00.000Z",
    "dateUpdated": "2024-08-05T23:02:11.567Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2016-1546",
      "date": "2026-09-22",
      "epss": "0.15923",
      "percentile": "0.96739"
    },
    "nvd": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E1F45B27-504B-4202-87B8-BD3B094003F1",
                    "vulnerable": true
                  },
                  {
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                    "vulnerable": true
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                "negate": false,
                "operator": "OR"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows."
          },
          {
            "lang": "es",
            "value": "El servidor HTTP Apache 2.4.17 y 2.4.18, cuando mod_http2 est\u00e1 activado, no limita el n\u00famero de trabajadores de flujo simult\u00e1neos para una sola conexi\u00f3n HTTP/2, lo que permite a atacantes remotos provocar una denegaci\u00f3n de servicio (corte de flujo de procesamiento) a trav\u00e9s de las ventanas de control de flujo modificadas."
          }
        ],
        "id": "CVE-2016-1546",
        "lastModified": "2026-05-06T22:30:45.220",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "MEDIUM",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "PARTIAL",
                "baseScore": 4.3,
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
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              },
              "exploitabilityScore": 8.6,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
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          ],
          "cvssMetricV30": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.0"
              },
              "exploitabilityScore": 2.2,
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              "source": "nvd@nist.gov",
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          ]
        },
        "published": "2016-07-06T14:59:01.503",
        "references": [
          {
            "source": "cret@cert.org",
            "tags": [
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        ],
        "sourceIdentifier": "cret@cert.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-399"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T21:57:28+00:00",
      "cve": "CVE-2016-1546",
      "id": "CVE-2016-1546",
      "initial_release_date": "2016-04-11T00:00:00+00:00",
      "product_status:fixed": "60",
      "product_status:known_not_affected": "31",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "httpd: mod_http2 denial-of-service by thread starvation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-1546.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.