CVE-2020-3569

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-12-12 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2020-09-23 01:15 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2021-11-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2022-05-03 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-06-17 03:18 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 3.3% in the next 30 days (EPSS).
• Severity: 8.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-09-23 01:15 UTC

Last modified

2026-06-17 03:18 UTC

Added to CISA KEV

2021-11-03

Exploit probability

3.3% · EPSS, next 30 days

Weakness

CWE-400 · Uncontrolled resource consumption

Record status

Analyzed

Affected

• Cisco iOS Xr 6.1.4
• Cisco iOS Xr 6.2.3
• Cisco iOS Xr 6.3.3
• Cisco iOS Xr 6.4.2
• Cisco iOS Xr 6.5.3
• Cisco iOS Xr 6.6.2
• Cisco iOS Xr 6.6.3
• Cisco iOS Xr 7.0.2

Attack profile CVSS 3.1 · 8.6

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

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