Integer Overflow or Wraparound 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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- published25 Nov 2025
- disclosed24 Nov 2025
- creditQingpeng Du
Introduced: 24 Nov 2025
CVE-2025-65495 (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 Integer Overflow or Wraparound via the tls_verify_call_back() function. An attacker can trigger a denial of service by supplying a specially crafted TLS certificate that causes i2d_X509() to return -1, which is then misused as a parameter to malloc(), potentially leading to a crash.