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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-2760-1 nettle security update
Debian DSA Debian DSA DSA-4933-1 nettle security update
EUVD EUVD EUVD-2021-7730 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.
Ubuntu USN Ubuntu USN USN-4906-1 Nettle vulnerability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.0008}

epss

{'score': 0.00069}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-03T17:37:23.808Z

Reserved: 2020-12-17T00:00:00

Link: CVE-2021-20305

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-04-05T22:15:12.727

Modified: 2024-11-21T05:46:19.280

Link: CVE-2021-20305

cve-icon Redhat

Severity : Important

Publid Date: 2021-03-16T00:00:00Z

Links: CVE-2021-20305 - Bugzilla

cve-icon OpenCVE Enrichment

No data.