by Kastro
Paper/Archive/CVE-2023-6936

CVE-2023-6936

wolfSSL wolfSSL — Heap-buffer over-read with WOLFSSL_CALLBACKS

EPSS 0.6%CVSS 9.1
critical.is priorityof 100
37
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 48.7.487 × 209.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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).

Affected

ProductAffectedFixed inSource
wolfSSL≤ 5.6.5–CNA
wolfssl≤ 5.6.5–CISA-ADP

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
wolfSSL (CNA)5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

patchgithub.com/wolfSSL/wolfssl/pull/6949advisorywolfssl.com/docs/security-vulnerabilities