Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
n/a https://github.com/curl/curl — libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to …
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N N U L N N 3.7 .0627 93.5 —
AFFECTED
Product Versions Fixed
https://github.com/curl/curl curl 7.10.4 to and include curl 7.77.0 – —
TIMELINE
Jan 6 Reserved by hackerone
Aug 5 Published (CNA: hackerone)
Oct 14 EXPLOIT PUBLISHED — CVE-2021-22924 (https://github.com/curl/curl). Public exploit reference added.
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.
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-22924 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
