CVE-2021-20305
Severity
8.1HIGH
EPSS
0.2%
top 60.88%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedApr 5
Latest updateMay 24
Description
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 availabi…
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 2.2 | Impact: 5.9
Affected Packages3 packages
Also affects: Debian Linux 10.0, 9.0, Fedora 33, Enterprise Linux 7.0, 8.0
Patches
🔴Vulnerability Details
3📋Vendor Advisories
4Microsoft▶
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 functi↗2021-04-13
Debian▶
CVE-2021-20305: nettle - A flaw was found in Nettle in versions before 3.7.2, where several Nettle signat...↗2021