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CVE-2021-22924

Published: Aug 5, 2021Updated: Jun 9, 2025 Sources: CVE List NVD BDU csafCWE-20
NVD MITRE
3.7CVSSLOW
EPSS Score
6.3%
Top 7.3%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-20CWE-706

Affected Products

https://github.com/curl/curln/a
libcurlhaxxOSS Libraries
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
debian linuxdebian
On-premOS
Operating Systems / linux-distro
cloud backupnetappHardware Firmware
haxxoss-projectSEOSS Librariesaka haxx.se
fedoraprojectoss-projectUSOperating Systemsaka fedora project
debianoss-projectGBOperating Systemsaka debian gnu/linux
netappcommercialUSHardware Firmware
and 35 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://hackerone.com/reports/1223565
hackerone.com
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/
lists.fedoraproject.org
https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html
lists.debian.org
and 34 more references View all →

Timeline

Published
Aug 5, 2021
Last Updated
Jun 9, 2025

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