Security readout for executives and security teams
Plain-English summary
CVE-2020-3569 affects Cisco IOS XR Software handling of DVMRP/IGMP traffic. A remote unauthenticated attacker can crash the IGMP process or drive memory exhaustion, potentially destabilizing routing processes. This is an availability risk to network infrastructure, not a data-theft issue in the provided sources.
Executive priority
Treat as urgent for networks using Cisco IOS XR because exploitation can disrupt routing availability. Prioritize critical routers, service-provider paths, and sites where instability would affect business continuity or customer connectivity.
Technical view
Cisco describes multiple DVMRP vulnerabilities caused by incorrect IGMP packet handling in IOS XR. Crafted IGMP traffic can immediately crash IGMP or consume memory until crash, with possible impact to interior and exterior routing protocols. CVSS is 8.6, network exploitable, low complexity, no privileges, no user interaction.
Likely exposure
Exposure is most likely on Cisco IOS XR devices where DVMRP/IGMP processing is reachable. The bundle does not provide affected release ranges, so teams must confirm versions and feature state against Cisco’s advisory and device inventory.
Exploitation context
CISA lists CVE-2020-3569 in the Known Exploited Vulnerabilities catalog, so active exploitation is supported. The provided sources do not include exploit tooling details or describe the scale, targeting, or timing of exploitation.
Researcher notes
The evidence is strong for vulnerability class, exploitability, and KEV status, but incomplete for affected versions and current fixes in the bundle. Avoid assuming specific releases or mitigations beyond Cisco guidance. Focus validation on feature exposure, process health, memory behavior, and routing impact.
Mitigation direction
- Check Cisco’s advisory for affected and fixed IOS XR releases.
- Prioritize updates for internet-facing or critical routing infrastructure.
- Confirm whether DVMRP/IGMP is required on exposed interfaces.
- Limit unnecessary multicast routing exposure according to vendor guidance.
- Monitor devices for IGMP crashes, memory exhaustion, and routing instability.
Validation and detection
- Inventory Cisco IOS XR devices and software releases.
- Verify DVMRP/IGMP feature use and reachable interfaces.
- Compare installed releases with Cisco advisory guidance.
- Review logs for IGMP process crashes or memory pressure.
- Check routing protocol stability around suspected events.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-3569 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.6HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20200829 Cisco IOS XR Software DVMRP Memory Exhaustion VulnerabilitiesCVE reference · vendor-advisory, x_refsource_CISCO
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3569CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.