CVE-2021-20305
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 1.7%
exploitation probability
1.7%top 24% of all CVEs
observed exploitation
nono source reports it
A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.
Affected products
n/a · nettleReferences
https://bugzilla.redhat.com/show_bug.cgi?id=1942533https://lists.debian.org/debian-lts-announce/2021/09/msg00008.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/https://security.gentoo.org/glsa/202105-31https://security.netapp.com/advisory/ntap-20211022-0002/https://www.debian.org/security/2021/dsa-4933