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.
Published: 2021-04-05
Score: 8.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

No remediation available yet.

Tracking

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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
History

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

Type Values Removed Values Added
Metrics epss

{'score': 0.0008}

epss

{'score': 0.00069}


Subscriptions

Debian Debian Linux
Fedoraproject Fedora
Netapp Active Iq Unified Manager Ontap Select Deploy Administration Utility
Nettle Project Nettle
Redhat Enterprise Linux Rhel Aus Rhel E4s Rhel Eus Rhel Tus
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

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

Reserved: 2020-12-17T00:00:00.000Z

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.

Weaknesses