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Vulnerability record · CVE-2021-3580 · published 5 August 2021

CVE-2021-3580: Nettle project nettle improper input validation vulnerability

Nettle Project · Nettle

A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and denial of service.

7.5 CVSS 3.1 High EPSS 2.7% · top 14.5% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext. An attacker could use this flaw to provide a manipulated ciphertext leading to application crash and denial of service.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1967983 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202401-24
https://security.netapp.com/advisory/ntap-20211104-0006/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1967983 Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202401-24
https://security.netapp.com/advisory/ntap-20211104-0006/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3580), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.