How to check if you are exposed to CVE-2020-3153
- Find every Cisco AnyConnect Secure system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
- 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.
- Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2020-3153.
US federal agencies had to fix this by 2022-11-14. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.
Timeline
- · Added to CISA's Known Exploited Vulnerabilities catalog
- · Fix-by date for US federal agencies, passed 1,448 days ago
Vendor advisories and fixes
Weakness type
More exploited Cisco vulnerabilities
CISA lists 102 exploited Cisco vulnerabilities. The closest matches:
- CVE-2020-3433Cisco AnyConnect Secure Mobility Client for Windows DLL Hijacking VulnerabilityAdded 2022-10-24
- 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
- CVE-2026-76460Cisco Identity Services Engine Incorrect Use of Privileged APIs VulnerabilityAdded 2026-09-16
- CVE-2026-76461Cisco Secure Email Gateway SQL Injection VulnerabilityAdded 2026-09-14
- CVE-2026-20079Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel VulnerabilityAdded 2026-09-09
- CVE-2026-20349Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection VulnerabilityAdded 2026-08-11
Keep going
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.