Severity
8.1HIGH
EPSS
0.2%
top 60.88%
CISA KEV
Not in KEV
Exploit
No known exploits
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

Debiannettle< 3.7.2-1+3
CVEListV5nettlenettle 3.7.2

Also affects: Debian Linux 10.0, 9.0, Fedora 33, Enterprise Linux 7.0, 8.0

Patches

🔴Vulnerability Details

3
GHSA
GHSA-6xrq-2ww3-f6h5: A flaw was found in Nettle in versions before 32022-05-24
CVEList
CVE-2021-20305: A flaw was found in Nettle in versions before 32021-04-05
OSV
CVE-2021-20305: A flaw was found in Nettle in versions before 32021-04-05

📋Vendor Advisories

4
Microsoft
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 functi2021-04-13
Ubuntu
Nettle vulnerability2021-04-13
Red Hat
nettle: Out of bounds memory access in signature verification2021-03-16
Debian
CVE-2021-20305: nettle - A flaw was found in Nettle in versions before 3.7.2, where several Nettle signat...2021
CVE-2021-20305 (HIGH CVSS 8.1) | A flaw was found in Nettle in versi | cvebase.io