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9.1 Critical

CVE-2021-22945 When sending data to an MQTT server,…

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*.

Affected products and versions

Product Affected versions Fixed in
https://github.com/curl/curl Versions not published
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.0 → < 3.1.5 3.1.5

Other CVEs of https://github.com/curl/curl

The 51 CVEs of https://github.com/curl/curl →
CVE-2023-28322 An information disclosure vulnerability exists in… 5.3 Medium CVE-2023-28319 A use after free vulnerability exists in… 7.5 High CVE-2023-28320 A denial of service vulnerability exists in… 5.9 Medium CVE-2023-28321 An improper certificate validation vulnerability exists in… 5.9 Medium
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