Secuno
ENNL
Book demo

CVE-2020-3569

Cisco IOS XR Software DVMRP Memory Exhaustion

8.6 HIGHActively exploited (CISA KEV)EPSS 3.32%
  1. Published22 Sept 2020
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

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.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

Cisco iOS XR< 6.5.2 · 6.1.4 · 6.2.3 · 6.3.3

Remediation

Fixed in
Cisco iOS XR≥ 6.5.2

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1031028.6
Pexip Infinity before 41.0 is affected by improper input validation in the signaling…
CVE-2026-1031018.6
Pexip Infinity 30.0 through 40.x before 41.0 is affected by improper input validation…
CVE-2026-904418.1
A missing authorization vulnerability in the wgagent management daemon's session…
CVE-2026-866088.2
The WP Recipe Maker WordPress plugin before 10.8.2 does not have any authorisation…
CVE-2026-143218.2
The divi-dash WordPress plugin before 1.0.7 does not validate the source of the client…
CVE-2026-336258.8
LMDeploy is a toolkit for compressing, deploying, and serving large language models.…

Frequently asked

Is CVE-2020-3569 being actively exploited?

Yes. CVE-2020-3569 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2020-3569?

CVE-2020-3569 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 3.32% probability of exploitation.

Which products are affected by CVE-2020-3569?

Affected products include Cisco iOS XR.

How do I fix CVE-2020-3569?

Upgrade affected software to a fixed version, for example Cisco iOS XR 6.5.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-3569 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.