What is CVE-2023-6936?

CVE-2023-6936 is a medium-severity vulnerability in Wolfssl, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2024-02-20.

How severe is CVE-2023-6936?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2023-6936 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Wolfssl

CVE-2023-6936

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).

Vulnerability class: Buffer Overflow

EPSS: 0.006 (45.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

Public proof-of-concept exploits

References

facts@wolfssl.com (Patch, patch, Issue Tracking)
facts@wolfssl.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-6936?: CVE-2023-6936 is a medium-severity vulnerability in Wolfssl, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2024-02-20.
How severe is CVE-2023-6936?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2023-6936 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.