CVE-2023-6936

wolfssl: In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS c...

CVE-2023-6936 is fixed in wolfssl on 1 platform by DEBIAN-CVE-2023-6936 (version 5.6.6-1.2), released February 20, 2024. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent
CVSS
9.1
critical
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0060
48th percentile

In wolfSSL prior to 5.6.6, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS client or network attacker can trigger a buffer over-read on the heap of 5 bytes (WOLFSSL_CALLBACKS is only intended for debugging).

Where it's fixed

ProductFixed inFixReleased
Linux
wolfssl · Debian 13.5 (trixie) 5.6.6-1.2 DEBIAN-CVE-2023-6936 Feb 20, 2024

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