Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-3580

CVE-2021-3580HIGH

n/a nettle — A flaw was found in the way nettle's RSA decryption functions handled specially crafted ciphertext.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0271   85.7     —

AFFECTED
  Product  Versions        Fixed
  nettle   nettle 3.7.3 –  —

TIMELINE
  Jun 4   Reserved by redhat
  Aug 5   Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2021-3580 (nettle). Received CVSS 7.5 and CPE data from NVD.

CWE-20 · CNA: redhat · CVSS v3.1 · 5 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 4, 2021	Reserved	Reserved by redhat
August 5, 2021	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-3580 (nettle). Received CVSS 7.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	nettle	—	nettle 3.7.3	—

Weaknesses

CWE-20

References (5)

https://bugzilla.redhat.com/show_bug.cgi?id=1967983 [Issue Tracking, Patch, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/202401-24
https://security.netapp.com/advisory/ntap-20211104-0006/ [Third Party Advisory]

Authoritative record: CVE-2021-3580 at cve.org

Weaknesses: CWE-20

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3580 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.