Use After Free Affecting libcurl package, versions *


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
6.68% (94th percentile)

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  • Snyk IDSNYK-RHEL7-LIBCURL-10336165
  • published10 Jun 2025
  • disclosed15 Sept 2021

Introduced: 15 Sep 2021

CVE-2021-22945  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 libcurl.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcurl package and not the libcurl package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it again.

CVSS Base Scores

version 3.1