PT-2024-15130 · Wolfssl+1 · Wolfssl+1

Lucca Hirschi + 3 · CVE-2023-6936 · Published 2024-02-20 · Updated 2026-07-14

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Name of the Vulnerable Software and Affected Versions wolfSSL versions prior to 5.6.6

Description The issue allows a malicious TLS client or network attacker to trigger a buffer over-read on the heap of 5 bytes if callback functions are enabled via the WOLFSSL CALLBACKS flag. This flag is only intended for debugging purposes.

Recommendations For versions prior to 5.6.6, update to version 5.6.6 or later to resolve the issue. As a temporary workaround, consider disabling the WOLFSSL CALLBACKS flag to prevent exploitation.

Exploit

Fix

Buffer Over-read

Out of bounds Read

Weakness Enumeration

CWE-126

CWE-125

Related Identifiers

CVE-2023-6936

JLSEC-2026-678

Affected Products

Debian

Wolfssl

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6936.json · Exploit
• https://github.com/wolfSSL/wolfssl/pull/6949 · Patch
• https://wolfssl.com/docs/security-vulnerabilities · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-6936 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-6936 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-6936 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-6936 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-6936 · Vendor Advisory
• https://osv.dev/vulnerability/JLSEC-2026-678 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-6936 · Security Note
• https://ubuntu.com/security/CVE-2023-6936 · Vendor Advisory
• https://github.com/wolfSSL/wolfssl · Note
• https://github.com/wolfSSL/wolfssl/blob/v5.6.6-stable/ChangeLog.md#vulnerabilities · Note
• https://t.me/cvenotify/72053 · Telegram Post
• https://twitter.com/CVEnew/status/1760071859515924513 · Twitter Post