CVE WatchOct 14, 2026

CVE-2021-22945

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

CVSS

9.1

Critical

EPSS

6.7%

p94

KEV

—

Exploit Today

0-100

Published: Sep 23, 2021 · Last modified: Oct 14, 2026 · CWE-415

EPSS · 30d

6.7%EPSS · 30 days6.7%

2026-10-042026-10-31

Technical description

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*.

Official references

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