CVE-2020-3569

Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerabilities

HIGH

8.6

CVSS Score

Published: September 23, 2020 at 12:25 AM UTC

Updated: June 17, 2026 at 03:18 AM UTC

43 products affected across 1 vendorIOS XrAsr 9010Asr 9904

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Severity

HIGH8.6

Exploitation

CISA KEV

Exploit prediction

EPSS 3%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score3.3%

EPSS (Exploit Prediction Scoring System) estimates a 3.3% chance this CVE is exploited in the wild within the next 30 days — higher than 89% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Unknown

Added to KEV

Nov 3, 2021

Remediation Due

May 3, 2022

1638 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2020-3569

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xr · Cisco

95%

v < 6.5.26.1.4 6.2.3 6.3.3 6.4.2 6.4.3 6.5.3 6.6.2 6.6.3 7.0.2 7.1.15 7.1.2

Affected range stops below 6.5.2, so it looks safe — our inference, not a vendor statement

cisco-asr-9000v (environment) · cisco-asr-9001 (environment) · cisco-asr-9006 (environment) · cisco-asr-9010 (environment) · cisco-asr-9901 (environment) · cisco-asr-9903 (environment) · cisco-asr-9904 (environment) · cisco-asr-9906 (environment) · cisco-asr-9910 (environment) · cisco-asr-9912 (environment) · cisco-asr-9922 (environment) · cisco-crs (environment) · cisco-crs-1-16-slot-line-card-chassis (environment) · cisco-crs-1-16-slot-single-shelf-system (environment) · cisco-crs-1-4-slot-single-shelf-system (environment) · cisco-crs-1-8-slot-line-card-chassis (environment) · cisco-crs-1-8-slot-single-shelf-system (environment) · cisco-crs-1-fabric-card-chassis (environment) · cisco-crs-1-line-card-chassis-dual (environment) · cisco-crs-1-line-card-chassis-multi (environment) · cisco-crs-1-multishelf-system (environment) · cisco-crs-3-16-slot-single-shelf-system (environment) · cisco-crs-3-4-slot-single-shelf-system (environment) · cisco-crs-3-8-slot-single-shelf-system (environment) · cisco-crs-3-multishelf-system (environment) · cisco-crs-8-s-b-crs (environment) · cisco-crs-8-scrs (environment) · cisco-crs-performance-route-processor (environment) · cisco-crs-x (environment) · cisco-crs-x-16-slot-single-shelf-system (environment) · cisco-crs-x-multishelf-system (environment) · cisco-ncs-5001 (environment) · cisco-ncs-5002 (environment) · cisco-ncs-5011 (environment) · cisco-ncs-520 (environment) · cisco-ncs-540 (environment) · cisco-ncs-5501 (environment) · cisco-ncs-5502 (environment) · cisco-ncs-5508 (environment) · cisco-ncs-5516 (environment) · cisco-ncs-560 (environment) · cisco-ncs-6008 (environment)

Asr 9000V · Ciscodevice

80%

All versions

Asr 9001 · Ciscodevice

80%

All versions

Asr 9006 · Ciscodevice

80%

All versions

Asr 9010 · Ciscodevice

80%

All versions