Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 88.0 |
| Mozilla | Firefox Esr | < 78.10 |
| Mozilla | Thunderbird | < 78.10 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1698503Permissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1698503Permissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/Release NotesVendor Advisory
FAQ
What is CVE-2021-29946?
CVE-2021-29946 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 E...
How severe is CVE-2021-29946?
CVE-2021-29946 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-29946?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.