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HTTP Request Smuggling Affecting firefox package, versions <91.0.1-1

0.0
high

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Confidentiality High
    Integrity High

    Threat Intelligence

    EPSS 0.16% (53rd percentile)
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NVD
8.1 high
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Red Hat
7.5 high
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SUSE
7.5 high

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  • Snyk ID SNYK-DEBIANUNSTABLE-FIREFOX-1567241
  • published 19 Aug 2021
  • disclosed 3 Nov 2021
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Introduced: 19 Aug 2021

CVE-2021-29991 Open this link in a new tab
CWE-444 Open this link in a new tab

How to fix?

Upgrade Debian:unstable firefox to version 91.0.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.