CVE-2024-20359: Cisco ASA and FTD Privilege Escalation Vulnerability

How to check if you are exposed to CVE-2024-20359

1. Find every Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2024-20359.

US federal agencies had to fix this by 2024-05-01. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

1. 2024-04-24 · Added to CISA's Known Exploited Vulnerabilities catalog
2. 2024-05-01 · Fix-by date for US federal agencies, passed 914 days ago

Vendor advisories and fixes

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-persist-rce-FLsNXF4h

Weakness type

• CWE-94

More exploited Cisco vulnerabilities

CISA lists 102 exploited Cisco vulnerabilities. The closest matches:

• CVE-2024-20481Cisco ASA and FTD Denial-of-Service VulnerabilityAdded 2024-10-24
• CVE-2024-20353Cisco ASA and FTD Denial of Service VulnerabilityAdded 2024-04-24
• CVE-2020-3259Cisco ASA and FTD Information Disclosure VulnerabilityAdded 2024-02-15
• CVE-2020-3580Cisco ASA and FTD Cross-Site Scripting (XSS) VulnerabilityAdded 2021-11-03
• CVE-2020-3452Cisco ASA and FTD Read-Only Path Traversal VulnerabilityAdded 2021-11-03
• CVE-2026-76418Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference VulnerabilityAdded 2026-10-29
• CVE-2026-76519Cisco Secure Email Gateway Relative Path Traversal VulnerabilityAdded 2026-10-14
• CVE-2026-76504Cisco Catalyst SD-WAN Manager Hex Encoding VulnerabilityAdded 2026-09-30

Keep going

• All exploited CVEs
• Check another CVE
• What is CISA KEV?
• What is EPSS?

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.