Vulnerability · Published Jul 16, 2025 · Assigned by CPANSec
CVE-2025-40919Authen::DigestMD5 versions 0.01 through 0.04 for Perl generate the cnonce insecurely
Medium 6.5
In plain English
A medium-severity security flaw in Authen::DigestMD5 from SALVA. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official description
Authen::DigestMD5 versions 0.01 through 0.02 for Perl generate the cnonce insecurely. The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. According to RFC 2831, "The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy."
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SALVA | Authen::DigestMD5 | 0.01 – through 0.04 |
Weakness: CWE-340, CWE-338 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N