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Back to active CVEs
High · CVSS 8.6Known ExploitedCVE-2020-3569

Cisco IOS XR Software DVMRP Memory Exhaustion VulnerabilitiesCVE-2020-3569

Answer in brief

CVE-2020-3569 records a High severity (CVSS 8.6) vulnerability in Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities. The current sources mark it as known exploited. The current feed maps Cisco/Cisco IOS XR Software (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2020Updated Oct 21, 2025Source checked Nov 1, 2026First seen by HOL May 24, 2026Material review Oct 21, 2025
Upstream Advisory

Key facts

Risk
High · CVSS 8.6
Exploitation
Known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.6. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Cisco/Cisco IOS XR Software (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Cisco/Cisco IOS XR Softwaregenericn/aNot reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Cisco/Cisco IOS XR Software.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 23, 2020

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    May 24, 2026

  4. Added to CISA KEV

    Nov 3, 2021

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • Source referencetools.cisco.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Gitea Helm chart upload decompression denial of serviceAlso CWE-400
  • ag-ui-protocol ag-ui HTTP Transport e.text resource consumptionAlso CWE-400
  • ag-ui-protocol ag-ui SSE Parser sse.ts parseSSEStream resource consumptionAlso CWE-400
  • ag-ui-protocol ag-ui Interrupt expiry index.ts isInterruptExpired resource consumptionAlso CWE-400

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-400
Source
CVE List V5
Source checked
Nov 1, 2026
References
2 linked sources
Open source record