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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
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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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T12:05:18+00:00",
      "cve": "CVE-2020-11080",
      "id": "CVE-2020-11080",
      "initial_release_date": "2020-06-02T00:00:00+00:00",
      "product_status:fixed": "539",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nghttp2: overly large SETTINGS frames can lead to DoS",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-11080.json",
      "version": "3"
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{\"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.