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.
                
            Metrics
Affected Vendors & Products
Advisories
    | Source | ID | Title | 
|---|---|---|
|  Debian DLA | DLA-2760-1 | nettle security update | 
|  Debian DSA | DSA-4933-1 | nettle security update | 
|  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 | USN-4906-1 | Nettle vulnerability | 
Fixes
    Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
        History
                    Wed, 16 Jul 2025 13:45:00 +0000
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 MITRE
                        MITRE
                    Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2024-08-03T17:37:23.808Z
Reserved: 2020-12-17T00:00:00
Link: CVE-2021-20305
 Vulnrichment
                        Vulnrichment
                    No data.
 NVD
                        NVD
                    Status : Modified
Published: 2021-04-05T22:15:12.727
Modified: 2024-11-21T05:46:19.280
Link: CVE-2021-20305
 Redhat
                        Redhat
                     OpenCVE Enrichment
                        OpenCVE Enrichment
                    No data.