CVE-2020-11993 (GCVE-0-2020-11993)

Vulnerability from cvelistv5 – Published: 2020-08-07 15:32 – Updated: 2024-08-04 11:48
VLAI
Summary
Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • Push Diary Crash on Specifically Crafted HTTP/2 Header
Assigner
References
URL Tags
https://httpd.apache.org/security/vulnerabilities… x_refsource_MISC
https://security.gentoo.org/glsa/202008-04 vendor-advisoryx_refsource_GENTOO
https://lists.apache.org/thread.html/r9e9f1a76097… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5debe8f8272… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r623de9b2b24… mailing-listx_refsource_MLIST
https://usn.ubuntu.com/4458-1/ vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://www.debian.org/security/2020/dsa-4757 vendor-advisoryx_refsource_DEBIAN
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020081… x_refsource_CONFIRM
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
http://packetstormsecurity.com/files/160393/Apach… x_refsource_MISC
https://lists.apache.org/thread.html/rf6449464fd8… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r06f0d87ebb6… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r09bb998baee… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rc998b18880d… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rdf3e5d0a5f5… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9f93cf6dde3… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r3c5c3104813… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rf71eb428714… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r2c6083f6a20… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r76142b8c511… mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version
n/a Apache HTTP Server Affected: 2.4.20 to 2.4.43
Show details on NVD website
To clipboard 

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        ],
        "sourceIdentifier": "security@apache.org",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-444"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
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        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-21T05:39:19+00:00",
      "cve": "CVE-2020-11993",
      "id": "CVE-2020-11993",
      "initial_release_date": "2020-08-07T00:00:00+00:00",
      "product_status:fixed": "361",
      "product_status:known_affected": "3",
      "product_status:known_not_affected": "16",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "httpd: mod_http2 concurrent pool usage",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-11993.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.



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.