Vulnerability Details CVE-2025-34468
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).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 55.5%
CVSS Severity
CVSS v3 Score 9.8
References
Products affected by CVE-2025-34468
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cpe:2.3:a:libcoap:libcoap:4.1.1
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cpe:2.3:a:libcoap:libcoap:4.1.2
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cpe:2.3:a:libcoap:libcoap:4.2.0
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cpe:2.3:a:libcoap:libcoap:4.2.1
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cpe:2.3:a:libcoap:libcoap:4.3.0
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cpe:2.3:a:libcoap:libcoap:4.3.1
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cpe:2.3:a:libcoap:libcoap:4.3.2
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cpe:2.3:a:libcoap:libcoap:4.3.3
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cpe:2.3:a:libcoap:libcoap:4.3.4
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cpe:2.3:a:libcoap:libcoap:4.3.4a
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cpe:2.3:a:libcoap:libcoap:4.3.5