Bug 1995267 (CVE-2021-29991) - CVE-2021-29991 Mozilla: Header Splitting possible with HTTP/3 Responses
Summary: CVE-2021-29991 Mozilla: Header Splitting possible with HTTP/3 Responses
Keywords:
Status: NEW
Alias: CVE-2021-29991
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
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Depends On: 1996585 1996586 1996588 1996589 1996590 1996591 1996592 1996593 1996594 1996595 1996596 1996597
Blocks: 1995268
TreeView+ depends on / blocked
 
Reported: 2021-08-18 17:24 UTC by Pedro Sampaio
Modified: 2022-04-17 21:34 UTC (History)
5 users (show)

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Description Pedro Sampaio 2021-08-18 17:24:29 UTC
Firefox incorrectly accepted a newline in a HTTP/3 header, interpreting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3.

References:

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


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