VULNERABILITY INTELLIGENCE
CVE-2020-11080
CVSS score3.7 LOW
EPSS probability5.32%
CISA KEVNot currently listed
Published2020-06-03
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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.
Weakness classification
- security-advisories@github.com: CWE-707
- nvd@nist.gov: CWE-400
Primary references
- security-advisories@github.com — Mailing List, Third Party Advisory
- security-advisories@github.com — Patch, Third Party Advisory
- security-advisories@github.com — Patch, Third Party Advisory
- security-advisories@github.com — Patch, Third Party Advisory
- security-advisories@github.com — Mailing List, Third Party Advisory
- security-advisories@github.com
- security-advisories@github.com
- security-advisories@github.com
- security-advisories@github.com — Third Party Advisory
- security-advisories@github.com — Not Applicable, Third Party Advisory
- security-advisories@github.com — Patch, Third Party Advisory
- security-advisories@github.com — Third Party Advisory