CVE-2021-22924

Description

libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.

How to fix CVE-2021-22924

To remediate CVE-2021-22924, upgrade the affected package to a fixed version below.

• —upgrade to 7.78.0-r0 or later
• —upgrade to 7.74.0-1.3+deb11u2 or later

Is CVE-2021-22924 being exploited?

Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 7.78.0-r0
• from 0, < 7.74.0-1.3+deb11u2

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2021-22924
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-22924