What is CVE-2020-3527?

CVE-2020-3527 is a high-severity vulnerability in Cisco Catalyst C9200l-24p-4g, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2020-09-24.

How severe is CVE-2020-3527?

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

Resource exhaustion in Cisco Catalyst C9200l-24p-4g

CVE-2020-3527

A vulnerability in the Polaris kernel of Cisco Catalyst 9200 Series Switches could allow an unauthenticated, remote attacker to crash the device. The vulnerability is due to insufficient packet size validation. An attacker could exploit this vulnerability by sending jumbo frames or frames larger than the configured MTU size to the management interface of this device. A successful exploit could allow the attacker to crash the device fully before an automatic recovery.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-09-24 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.014 (71.6th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Weakness classification (CWE)

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-JP-DOS-g… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2020-3527?: CVE-2020-3527 is a high-severity vulnerability in Cisco Catalyst C9200l-24p-4g, classified under Improper Input Validation. CVSS score: 8.6/10. Published 2020-09-24.
How severe is CVE-2020-3527?: High severity. CVSS v3 base score is 8.6 out of 10.