VDB
CVE-2021-29991
CVE-2021-29991
PUBLISHED
Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.
EPSS 0.31% · 54.1th percentile
Risk Scores
EPSS Score
0.31%
54.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:18.04:LTS | mozjs52 | 0, 52.3.1-7fakesync1, 52.3.1-0ubuntu3 |
| Ubuntu:18.04:LTS | thunderbird | *, 0, 1:78.14.0+build1-0ubuntu0.18.04.2 |
| Ubuntu:20.04:LTS | mozjs52 | 52.9.1-1build1, 0, 52.9.1-1ubuntu3 |
| Ubuntu:20.04:LTS | firefox | *, 0, 69.0.3+build1-0ubuntu1 |
| Ubuntu:18.04:LTS | firefox | 65.0+build2-0ubuntu0.18.04.1, 66.0+build3-0ubuntu0.18.04.1, 66.0.1+build1-0ubuntu0.18.04.1 |
| Ubuntu:20.04:LTS | mozjs68 | 0, 68.5.0-1~fakesync, 68.5.0-2~fakesync |
| Ubuntu:20.04:LTS | thunderbird | 1:68.2.1+build1-0ubuntu1, 1:68.1.2+build1-0ubuntu1, 0 |
| Ubuntu:18.04:LTS | mozjs38 | 0, *, 38.8.0~repack1-0ubuntu4 |
| Ubuntu:22.04:LTS | mozjs78 | 0, 78.13.0-1, 78.15.0-2 |
Timeline
- Aug 18, 2021 CVE Published
- Nov 3, 2021 EPSS Score
- Dec 29, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Apr 19, 2022 EPSS Score
- Jun 14, 2022 EPSS Score
- Aug 10, 2022 EPSS Score
- Oct 4, 2022 EPSS Score
- Nov 29, 2022 EPSS Score
- Jan 24, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-29991 third-party-advisory
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-37/#CVE-2021-29991 third-party-advisory
- https://ubuntu.com/security/notices/USN-5047-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-5248-1 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-29991 third-party-advisory