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Vulnerability · Published Jun 3, 2020 · Assigned by GitHub_M

CVE-2020-11080Denial of service in nghttp2

Low 3.7

In plain English

A low-severity security flaw in nghttp2 from nghttp2. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 5.3% (higher than 93% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)5.3%top 7.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8libnghttp21.33.0-3.el8_2.1ALSA-2020:2755
AlmaLinux:8libnghttp2-devel1.33.0-3.el8_2.1ALSA-2020:2755
AlmaLinux:8nghttp21.33.0-3.el8_2.1ALSA-2020:2755
AlmaLinux:8nodejs-nodemon1.18.3-1.module_el8.3.0+2047+b07ac28eALSA-2020:2848
AlmaLinux:8nodejs-nodemon1.18.3-1.module_el8.3.0+2023+d2377ea3ALSA-2020:2848
AlmaLinux:8nodejs-nodemon1.18.3-1.module_el8.3.0+2023+d2377ea3ALSA-2020:2852
AlmaLinux:8nodejs-nodemon1.18.3-1.module_el8.3.0+2047+b07ac28eALSA-2020:2852
AlmaLinux:8nodejs-packaging17-3.module_el8.3.0+2023+d2377ea3ALSA-2020:2848
AlmaLinux:8nodejs-packaging17-3.module_el8.4.0+2224+b07ac28eALSA-2020:2848
AlmaLinux:8nodejs-packaging17-3.module_el8.4.0+2521+c668cc9fALSA-2020:2848
AlmaLinux:8nodejs-packaging17-3.module_el8.4.0+2224+b07ac28eALSA-2020:2852
AlmaLinux:8nodejs-packaging17-3.module_el8.4.0+2521+c668cc9fALSA-2020:2852
AlmaLinux:8nodejs-packaging17-3.module_el8.3.0+2023+d2377ea3ALSA-2020:2852
Alpine:v3.20nghttp21.41.0-r0ALPINE-CVE-2020-11080
Alpine:v3.21nghttp21.41.0-r0ALPINE-CVE-2020-11080
Alpine:v3.22nghttp21.41.0-r0ALPINE-CVE-2020-11080
Alpine:v3.23nghttp21.41.0-r0ALPINE-CVE-2020-11080
Alpine:v3.24nghttp21.41.0-r0ALPINE-CVE-2020-11080
Alpine:v3.20nodejs12.18.0-r0ALPINE-CVE-2020-11080
Alpine:v3.21nodejs12.18.0-r0ALPINE-CVE-2020-11080
Alpine:v3.22nodejs12.18.0-r0ALPINE-CVE-2020-11080
Alpine:v3.23nodejs12.18.0-r0ALPINE-CVE-2020-11080
Alpine:v3.24nodejs12.18.0-r0ALPINE-CVE-2020-11080
Alpine:v3.20nodejs-current14.4.0-r0ALPINE-CVE-2020-11080
Alpine:v3.21nodejs-current14.4.0-r0ALPINE-CVE-2020-11080
Alpine:v3.22nodejs-current14.4.0-r0ALPINE-CVE-2020-11080
Alpine:v3.23nodejs-current14.4.0-r0ALPINE-CVE-2020-11080
Alpine:v3.24nodejs-current14.4.0-r0ALPINE-CVE-2020-11080
Debian:12nghttp21.41.0-1DEBIAN-CVE-2020-11080
Debian:13nghttp21.41.0-1DEBIAN-CVE-2020-11080
Debian:14nghttp21.41.0-1DEBIAN-CVE-2020-11080
Debian:12nodejs10.21.0~dfsg-1DEBIAN-CVE-2020-11080
Debian:13nodejs10.21.0~dfsg-1DEBIAN-CVE-2020-11080
Debian:14nodejs10.21.0~dfsg-1DEBIAN-CVE-2020-11080
Rocky Linux:8nghttp20:1.33.0-3.el8_3.1RLSA-2020:2755
Rocky Linux:8nodejs-nodemon0:1.18.3-1.module+el8.3.0+101+f84c7154RLSA-2020:2848
Rocky Linux:8nodejs-nodemon0:1.18.3-1.module+el8.3.0+101+f84c7154RLSA-2020:2852
Rocky Linux:8nodejs-packaging0:17-3.module+el8.3.0+101+f84c7154RLSA-2020:2852
Rocky Linux:8nodejs-packaging0:17-3.module+el8.3.0+101+f84c7154RLSA-2020:2848

Affected products (as reported)

VendorProductVersions
nghttp2 nghttp2 < 1.41.0

Weakness: CWE-707 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References