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CVE-2021-29991

CVSS v3.1 8.1 (High)
81% Progress
CVSS v2.0 5.8 (Medium)
58% Progress
EPSS 0.16 % (53th)
0.16% Progress
Affected Products 2
Advisories 15
Info CVSS EPSS CAPEC Affected Configurations References Security Advisories Packages & Software OVAL Tools, Exploits & PoC Graph Web & Social Timeline

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.

Weaknesses
CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVE Status
PUBLISHED
CNA
Mozilla Corporation
Published Date
2021-11-03 01:15:07
(2 years ago)
Updated Date
2021-11-04 21:01:32
(2 years ago)

Affected Products

Mozilla

Configuration #1

    CPE23 From Up To
  Mozilla Firefox prior 91.0.1 version cpe:2.3:a:mozilla:firefox < 91.0.1
  Mozilla Thunderbird prior 91.0.1 version cpe:2.3:a:mozilla:thunderbird < 91.0.1