CVE-2025-66016 is a low severity vulnerability with a CVSS score of 0.0. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
cggmp21 concerns a missing check in the ZK proof that enables an attack in which a single malicious signer can reconstruct full private key.
cggmp21 v0.6.3 is a patch release that contains a fix that introduces this specific missing checkcggmp24 v0.7.0-alpha.2 which contains many other security checks as a precaution. Follow migration guideline to upgrade.Update to cggmp21 v0.6.3, a minor release that contains a minimal security patch.
However, for full mitigation, users will need to upgrade to cggmp24 v0.7.0-alpha.2 as it contains many more security check implementations.
Read this blog post to learn more.
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