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Vulnerability IntelligenceCVE-2021-29991

CVE-2021-29991

HIGH8.1

Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers

Published Nov 3, 2021

Modified 1 years ago

Fix available

Details

Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.

Affected Packages

Firefox

Ubuntu 14.04 LTSUbuntu 16.04 LTSUbuntu 18.04 LTSUbuntu 20.04 LTSUbuntu 22.04 LTS

Fixed in:

91.0.1

Mozilla Firefox

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

91.0.1

References

WEB

https://bugzilla.mozilla.org/show_bug.cgi?id=1724896

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2021-29991

WEB

https://www.mozilla.org/security/advisories/mfsa2021-37/

CVSS Analysis

CVSS v3.1

8.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

NoneA:N

8.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Ecosystems(28)

Ubuntu 14.04 LTS Ubuntu 16.04 LTS Ubuntu 18.04 LTS Ubuntu 20.04 LTS Ubuntu 22.04 LTS

Timeline

PublishedNov 3, 2021

ModifiedAug 3, 2024

CVE-2021-29991 | Mondoo Vulnerability Intelligence