Description
Mozilla Firefox before 31.0 and Thunderbird before 31.0 allow remote attackers to cause a denial of service (X.509 certificate parsing outage) via a crafted certificate that does not use ASCII character encoding in a required context.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 31.0+build1-0ubuntu0.14.04.1 | USN-2295-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:31.0+build1-0ubuntu0.14.04.1 | USN-2296-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
Advisories 3
- USN-2295-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-2296-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- GLSA-201504-01 vendor-advisory
- 1030620 vdb-entry
- http://www.mozilla.org/security/announce/2014/mfsa2014-65.html
- 1030619 vdb-entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=997795
- 60628 third-party-advisory