Vulnerability Description
libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libcoap | Libcoap | <= 4.3.5 |
Related Weaknesses (CWE)
References
- https://github.com/obgm/libcoap/commit/30db3eaPatch
- https://github.com/obgm/libcoap/pull/1737Issue Tracking
- https://libcoap.net/Product
- https://www.vulncheck.com/advisories/libcoap-stack-based-buffer-overflow-in-addrThird Party Advisory
FAQ
What is CVE-2025-34468?
CVE-2025-34468 is a vulnerability with a CVSS score of 9.8 (CRITICAL). libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte ...
How severe is CVE-2025-34468?
CVE-2025-34468 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-34468?
Check the references section above for vendor advisories and patch information. Affected products include: Libcoap Libcoap.