If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of…

Description

If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to the parent process, an out of bounds write would have occurred leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.

Scores

EPSS (exploitation in 30 days)

2.8% · top 14% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

• Out of bounds write due to unexpected WebAuthN Extensions
• CWE-787 Out-of-bounds Write (opens in a new tab)All about CWE-787 and its CVEs

Affected products

• Mozilla · Thunderbird

  • affected unspecified – < 91.8

• Mozilla · Firefox

  • affected unspecified – < 99

• Mozilla · Firefox ESR

  • affected unspecified – < 91.8

References (4)

• https://www.mozilla.org/security/advisories/mfsa2022-13/ (opens in a new tab)x_transferred
• https://www.mozilla.org/security/advisories/mfsa2022-14/ (opens in a new tab)x_transferred
• https://www.mozilla.org/security/advisories/mfsa2022-15/ (opens in a new tab)x_transferred
• https://bugzilla.mozilla.org/show_bug.cgi?id=1755621 (opens in a new tab)x_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-28281](https://trackcve.app/badge/CVE-2022-28281.svg)](https://trackcve.app/cve/CVE-2022-28281)

Record last updated 15 Apr 2025, 20:09 UTC.