CVE-2020-11996 (GCVE-0-2020-11996)

Vulnerability from cvelistv5 – Published: 2020-06-26 16:27 – Updated: 2024-08-04 11:48
VLAI
Summary
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • Denial of Service
Assigner
References
URL Tags
https://lists.apache.org/thread.html/r5541ef6b6b6… x_refsource_CONFIRM
https://lists.apache.org/thread.html/ra7092f74925… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb4ee49ecc4c… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb820f1a2a02… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r8f748458945… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r74f5a8204ef… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rea65d6ef2e4… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rc80b96b4b96… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r93ca628ef3a… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r8f3d416c193… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9ad911fe494… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ref0339792ac… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r6c29801370a… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r3ea96d8f36d… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
https://www.debian.org/security/2020/dsa-4727 vendor-advisoryx_refsource_DEBIAN
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://lists.apache.org/thread.html/r2529016c311… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020070… x_refsource_CONFIRM
https://usn.ubuntu.com/4596-1/ vendor-advisoryx_refsource_UBUNTU
https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISC
https://lists.apache.org/thread.html/r5a4f80a6acc… mailing-listx_refsource_MLIST
Impacted products
Vendor Product Version
Apache Apache Tomcat Affected: 10.0.0-M1 to 10.0.0-M5
Affected: 9.0.0.M1 to 9.0.35
Affected: 8.5.0 to 8.5.55
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      "id": "CVE-2020-11996",
      "lastModified": "2024-11-21T04:59:04.687",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:N/A:P\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2020-06-26T17:15:10.153",
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      "sourceIdentifier": "security@apache.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"NVD-CWE-noinfo\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-11996\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2020-06-26T17:15:10.153\",\"lastModified\":\"2024-11-21T04:59:04.687\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.\"},{\"lang\":\"es\",\"value\":\"Una secuencia especialmente dise\u00f1ada de peticiones HTTP/2 enviadas a Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0-M5, versiones 9.0.0.M1 hasta 9.0.35 y versiones 8.5.0 hasta 8.5.55, podr\u00eda desencadenar un uso elevado de la CPU por varios segundos. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:31:30+00:00",
      "cve": "CVE-2020-11996",
      "id": "CVE-2020-11996",
      "initial_release_date": "2020-06-25T00:00:00+00:00",
      "product_status:fixed": "63",
      "product_status:known_affected": "10",
      "product_status:known_not_affected": "25",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "tomcat: specially crafted sequence of HTTP/2 requests can lead to DoS",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-11996.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.