CVE-2022-24884: Debian Linux

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

ecdsautils is a tiny collection of programs used for ECDSA (keygen, sign, verify). `ecdsa_verify_[prepare_]legacy()` does not check whether the signature values `r` and `s` are non-zero. A signature consisting only of zeroes is always considered valid, making it trivial to forge signatures. Requiring multiple signatures from different public keys does not mitigate the issue: `ecdsa_verify_list_legacy()` will accept an arbitrary number of such forged signatures. Both the `ecdsautil verify` CLI command and the libecdsautil library are affected. The issue has been fixed in ecdsautils 0.4.1. All older versions of ecdsautils (including versions before the split into a library and a CLI utility) are vulnerable.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Ecdsautils Project Ecdsautils: before 0.4.1 (fixed in 0.4.1)
• Fedoraproject Fedora: version 34 only; version 35 only; version 36 only

Published 2022-05-06. Last modified 2026-06-17.