CVE-2021-3580

Name: CVE-2021-3580
Creator: NVD / NIST
Published: 2021-08-05T21:15:12.853+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.69%

Last modified Jun 17, 2026

CVE-2021-3580 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.69% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.69%

83.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nettle Project	Nettle	< 3.7.3
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Debian	Debian Linux	9.0
Netapp	Ontap Select Deploy Administration Utility	All versions

References

https://bugzilla.redhat.com/show_bug.cgi?id=1967983Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00008.htmlMailing List, Third 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=1967983Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00008.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202401-24
https://security.netapp.com/advisory/ntap-20211104-0006/Third Party Advisory

Timeline

Published: Aug 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3580?

How severe is CVE-2021-3580?

CVE-2021-3580 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3580?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3580?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST