CVE-2021-20305
nettle - security update
8.1
HIGH
CVSS 3.1
EPSS 0.14%
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 availability.
How to fix CVE-2021-20305
To remediate CVE-2021-20305, upgrade the affected package to a fixed version below.
- —upgrade to 3.7.2-r0 or later
- —upgrade to 3.7.2-1 or later
- —upgrade to 3.3-1+deb9u1 or later
- —upgrade to 3.4.1-1+deb10u1 or later
Is CVE-2021-20305 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 3.7.2-r0
- from 0, < 3.7.2-1
- from 0, < 3.3-1+deb9u1
- from 0, < 3.4.1-1+deb10u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |