Improper Validation of Array Index Affecting libcoap package, versions [,cci.20200424)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-LIBCOAP-14105120
- published25 Nov 2025
- disclosed24 Nov 2025
- creditQingpeng Du
Introduced: 24 Nov 2025
CVE-2025-65499 (opens in a new tab)How to fix?
Upgrade libcoap to version cci.20200424 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Array Index via the tls_verify_call_back() function. An attacker can cause the application to crash by sending a specially crafted DTLS handshake that results in SSL_get_ex_data_X509_STORE_CTX_idx() returning -1.