CVE-2021-29946
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CVE-2021-29946
Published: 24 Jun 2021Last Modified: 16 Apr 2026
Summary:
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 < 88.
References: https://www.mozilla.org/security/advisories/mfsa2021-14/, https://www.mozilla.org/security/advisories/mfsa2021-15/, https://www.mozilla.org/security/advisories/mfsa2021-16/, https://bugzilla.mozilla.org/show_bug.cgi?id=1698503
Affected packages
Package
Name:
Purl:
Affected ranges
Type: N/A
Events:
Introduced- None
Fixed -None
Affected versions
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
