Out-of-bounds Read in Libcoap
CVE-2025-59391
A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (14.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
Affected products
- Libcoap
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Release Notes)
- cve@mitre.org (Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2025-59391?
- CVE-2025-59391 is a medium-severity vulnerability in Libcoap, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2025-12-08.
- How severe is CVE-2025-59391?
- Medium severity. CVSS v3 base score is 6.5 out of 10.