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CVE-2021-29991

—
CVSS 3.1
8.1 high
EPSS
<1%p58
Published
()
Modified
Description

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.

Vendors
mozilla
Products
firefox, thunderbird
Weakness
CWE-444
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD CVE.org GitHub PoCs EPSS (0.9%)

In the news

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