CVE-2020-11080
Denial of service in nghttp2
- State
- Published
- Severity
- 3.7 Low
- Published
- Jun 3, 2020
- Updated
- Jun 9, 2025
- Reserved
- Mar 30, 2020
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L | GitHub_M |
Weaknesses
- CWE-707 Improper Enforcement of Message or Data Structure
Affected Products
| Product | Versions |
|---|---|
nghttp2nghttp2 |
|
References
- DSA-4696vendor-advisory
- openSUSE-SU-2020:0802vendor-advisory
- FEDORA-2020-f7d15c8b77vendor-advisory
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr
- https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090
- https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394
- https://www.oracle.com/security-alerts/cpuoct2020.html
- FEDORA-2020-43d5a372fcvendor-advisory
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- [debian-lts-announce] 20211017 [SECURITY] [DLA 2786-1] nghttp2 security updatemailing-list
- https://www.oracle.com/security-alerts/cpuapr2022.html
- [debian-lts-announce] 20231016 [SECURITY] [DLA 3621-1] nghttp2 security updatemailing-list
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