Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-3569

CVE-2020-3569HIGH

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  C  N  N  H    8.6   .0332   88.2   YES

AFFECTED
  Product                Versions  Fixed
  Cisco IOS XR Software  n/a –     —

TIMELINE
  Dec 12  Reserved by cisco
  Sep 23  Published (CNA: cisco)
  Nov 3   Added to CISA KEV, remediation due 2022-05-03

CWE-400 · CNA: cisco · CVSS v3.1 · 2 references · KEV due May 3, 2022

Description

Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immediately crash the Internet Group Management Protocol (IGMP) process or make it consume available memory and eventually crash. The memory consumption may negatively impact other processes that are running on the device. These vulnerabilities are due to the incorrect handling of IGMP packets. An attacker could exploit these vulnerabilities by sending crafted IGMP traffic to an affected device. A successful exploit could allow the attacker to immediately crash the IGMP process or cause memory exhaustion, resulting in other processes becoming unstable. These processes may include, but are not limited to, interior and exterior routing protocols. Cisco will release software updates that address these vulnerabilities.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 12, 2019	Reserved	Reserved by cisco
September 23, 2020	Published	Published (CNA: cisco)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2022-05-03

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Cisco	Cisco IOS XR Software	—	n/a	—

Weaknesses

CWE-400

References (2)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-dvmrp-memexh-dSmpdvfz [vendor-advisory, x_refsource_CISCO]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3569 [government-resource]

Authoritative record: CVE-2020-3569 at cve.org

Vendors: cisco

Weaknesses: CWE-400

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-3569 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 Wednesday, October 7, 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.