Is CVE-2021-22924 in the CISA KEV catalog?

No. CVE-2021-22924 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22924?

CVE-2021-22924 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2021-22924?

CVE-2021-22924 has an EPSS score of 6.27% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22924?

Upgrade curl on debian 11 to 7.74.0-1.3+deb11u2 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22924

LOWEPSS 93th pctl

3.7

CVSS v3

NVD

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.

CWE-20Improper Input Validation CWE-706

How to fix

Remediation Available

curlDebian

Fixed in:7.74.0-1.3+deb11u2CVE-2021-22924

Fixed in:7.79.1-1CVE-2021-22924

curlUbuntu

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

libcurl3-gnutlsUbuntu

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

libcurl3-nssUbuntu

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

libcurl4Ubuntu

Fixed in:7.58.0-2ubuntu3.14USN-5021-1

Fixed in:7.68.0-1ubuntu2.6USN-5021-1

UniversalForwarderWindows application

Affected:9.0.0 9.0.6Fixed in:9.0.6Splunk, Inc.

Affected:8.2.0 8.2.12Fixed in:8.2.12Splunk, Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

6.27%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Patch4

Third-Party Advisory11

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-06-09.