CVE-2021-29946
High
Published: 24 June 2021
Published
24 June 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score
0.0016
37.1th percentile
Risk Priority
18
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-29946 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Mozilla Firefox. Its CVSS base score is 8.8 (High).
Operationally, ranked at the 37.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-16405
Vulnerability details
Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox <…
more
88.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
mozilla
firefox
≤ 88.0
mozilla
firefox esr
≤ 78.10
mozilla
thunderbird
≤ 78.10
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.