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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (46.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Wolfssl — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/wolfSSL/wolfssl/pull/6949/ (Patch, patch, Issue Tracking)
- www.wolfssl.com/docs/security-vulnerabilities/ (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.