---
id: CVE-2021-3580
title: >-
  A flaw was found in the way nettle's RSA decryption functions handled
  specially crafted ciphertext
summary: >-
  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.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-20
  - CWE-20
vendor: nettle_project
product: nettle
affected:
  - nettle < 3.7.3
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - debian_linux = 9.0
  - ontap_select_deploy_administration_utility
patched:
  - nettle 3.7.3
published: '2021-08-05'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:45.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-3580'
references:
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1967983'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html'
    label: secalert@redhat.com
  - url: 'https://security.gentoo.org/glsa/202401-24'
    label: secalert@redhat.com
  - url: 'https://security.netapp.com/advisory/ntap-20211104-0006/'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1967983'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/202401-24'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20211104-0006/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.02708
epssPercentile: 0.85608
ingestedAt: '2026-10-14T10:25:41.192Z'
---

## Overview

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.

## Affected

- `nettle < 3.7.3`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `debian_linux = 9.0`
- `ontap_select_deploy_administration_utility`

## Remediation

Upgrade past the affected range:

- `nettle 3.7.3`