What is CVE-2020-3456?

CVE-2020-3456 is a high-severity vulnerability in Cisco Adaptive Security Appliance (Asa) Software, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2020-10-21.

How severe is CVE-2020-3456?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Cisco Adaptive Security Appliance (Asa) Software

CVE-2020-3456

A vulnerability in the Cisco Firepower Chassis Manager (FCM) of Cisco FXOS Software could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack against a user of an affected device. The vulnerability is due to insufficient CSRF protections for the FCM interface. An attacker could exploit this vulnerability by persuading a targeted user to click a malicious link. A successful exploit could allow the attacker to send arbitrary requests that could take unauthorized actions on behalf of the targeted user.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2020-10-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.2th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxosfcm-… (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-3456?: CVE-2020-3456 is a high-severity vulnerability in Cisco Adaptive Security Appliance (Asa) Software, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2020-10-21.
How severe is CVE-2020-3456?: High severity. CVSS v3 base score is 8.8 out of 10.