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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 · CISA-ADP (v2.0.3)
Decision recorded 2025-06-09 15:44 UTC
CWE
  • CWE-707 - Improper Enforcement of Message or Data Structure
Assigner
References
Impacted products
Vendor Product Version CPE status
nghttp2 nghttp2 Affected: < 1.41.0
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    "microsoft_vex": {
      "current_release_date": "2020-08-18T00:00:00.000Z",
      "cve": "CVE-2020-11080",
      "id": "msrc_CVE-2020-11080",
      "initial_release_date": "2020-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Denial of service in nghttp2",
      "url": "https://msrc.microsoft.com/csaf/vex/2020/msrc_cve-2020-11080.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-11080\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2020-06-03T23:15:11.073\",\"lastModified\":\"2024-11-21T04:56:44.657\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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.\"},{\"lang\":\"es\",\"value\":\"En nghttp2 versiones anteriores a 1.41.0, la carga \u00fatil de la trama HTTP/2 SETTINGS demasiado grande causa una denegaci\u00f3n de servicio. El ataque de prueba de concepto involucra a un cliente malicioso que construye una trama SETTINGS con una longitud de 14,400 bytes (2400 entradas de configuraciones individuales) una y otra vez. El ataque causa que la CPU se aumente al 100%. nghttp2 versi\u00f3n v1.41.0 corrige esta vulnerabilidad. Existe una soluci\u00f3n alternativa a esta vulnerabilidad. Implemente la funci\u00f3n nghttp2_on_frame_recv_callback callback, y si la trama es recibida es la trama SETTINGS y el n\u00famero de entradas de configuraci\u00f3n es grande (por ejemplo, mayor a 32), luego desconecte la 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    "redhat_vex": {
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      "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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      "current_release_date": "2026-09-15T02:34:03Z",
      "cve": "CVE-2020-11080",
      "id": "CVE-2020-11080",
      "initial_release_date": "2023-02-15T03:59:56Z",
      "product_status:known_affected": "323",
      "product_status:known_not_affected": "71",
      "product_status:recommended": "757",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-11080",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-11080.json",
      "version": "47"
    },
    "vulnrichment": {
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[\"x_transferred\"]}, {\"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\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T11:21:14.514Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2020-11080\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-06-09T15:44:48.717109Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-06-09T15:44:38.923Z\"}}], \"cna\": {\"title\": \"Denial of service in nghttp2\", \"source\": {\"advisory\": \"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\": 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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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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.