What is CVE-2020-3566?

CVE-2020-3566 is a high-severity vulnerability in Cisco Ios Xr Software, classified under Uncontrolled Resource Consumption. CVSS score: 8.6/10. Published 2020-08-29.

How severe is CVE-2020-3566?

High severity. CVSS v3 base score is 8.6 out of 10.

Is CVE-2020-3566 known to be exploited?

Yes. CVE-2020-3566 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.

Resource exhaustion in Cisco Ios Xr Software

CVE-2020-3566

A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust process memory of an affected device. The vulnerability is due to insuffi…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.021 (84.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xr Software — versions n/a

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

20200829 Cisco IOS XR Software DVMRP Memory Exhaustion Vulnerability (vendor-advisory, x_refsource_CISCO)

Frequently asked questions

What is CVE-2020-3566?: CVE-2020-3566 is a high-severity vulnerability in Cisco Ios Xr Software, classified under Uncontrolled Resource Consumption. CVSS score: 8.6/10. Published 2020-08-29.
How severe is CVE-2020-3566?: High severity. CVSS v3 base score is 8.6 out of 10.
Is CVE-2020-3566 known to be exploited?: Yes. CVE-2020-3566 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.