CVE-2020-11080 (GCVE-0-2020-11080)

Vulnerability from cvelistv5 – Published: 2020-06-03 00:00 – Updated: 2025-06-09 15:45
VLAI?
Title
Denial of service in nghttp2
Summary
In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.
Severity ?
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
  • CWE-707 - Improper Enforcement of Message or Data Structure
Assigner
References
Impacted products
Vendor Product Version
nghttp2 nghttp2 Affected: < 1.41.0
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\"GHSA-q5wr-xfw9-q7xr\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 3.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"nghttp2\", \"product\": \"nghttp2\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.41.0\"}]}], \"references\": [{\"url\": \"https://www.debian.org/security/2020/dsa-4696\", \"name\": \"DSA-4696\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html\", \"name\": \"openSUSE-SU-2020:0802\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/\", \"name\": \"FEDORA-2020-f7d15c8b77\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujul2020.html\"}, {\"url\": \"https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr\"}, {\"url\": \"https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090\"}, {\"url\": \"https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/\", \"name\": \"FEDORA-2020-43d5a372fc\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpujan2021.html\"}, {\"url\": \"https://www.oracle.com//security-alerts/cpujul2021.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html\", \"name\": \"[debian-lts-announce] 20211017 [SECURITY] [DLA 2786-1] nghttp2 security update\", \"tags\": [\"mailing-list\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html\", \"name\": \"[debian-lts-announce] 20231016 [SECURITY] [DLA 3621-1] nghttp2 security update\", \"tags\": [\"mailing-list\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., \u003e 32), then drop the connection.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-707\", \"description\": \"CWE-707 Improper Enforcement of Message or Data Structure\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2023-10-16T17:06:24.016Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2020-11080\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-09T15:45:50.711Z\", \"dateReserved\": \"2020-03-30T00:00:00.000Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2020-06-03T00:00:00.000Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.