CVE-2026-20331: Protection Mechanism Failure

🗓️ 16 Sep 2026 00:00:00Reported by Rapid7Type

Cisco Secure Firewall and related software have protection mechanism failures (CWE-693).

Reporter	Title	Published	Views	Family All 10
BDU FSTEC	The vulnerabilities of Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Adaptive Security Appliance (ASA), as well as the Cisco Secure Firewall Management Center (formerly Cisco Firepower Management Center) software, are related to a flaw in the data protection mechanism. This flaw allows attackers to bypass existing security measures.	23 Sep 202600:00	–	bdu_fstec
Circl	CVE-2026-20331	16 Sep 202618:08	–	circl
Cisco	Cisco Secure Firewall Adaptive Security Appliance, Secure Firewall Threat Defense, and Secure Firewall Management Center Software Hardening Release: September 2026	16 Sep 202616:00	–	cisco
Cisco	Cisco Advance Notification for Publication of September 16, 2026, Security Advisories	9 Sep 202616:00	–	cisco
CVE	CVE-2026-20331	16 Sep 202616:56	–	cve
Cvelist	CVE-2026-20331 Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities	16 Sep 202616:56	–	cvelist
EUVD	EUVD-2026-80889	16 Sep 202616:56	–	euvd
NVD	CVE-2026-20331	16 Sep 202617:17	–	nvd
The Hacker News	Cisco Warns of New Zero-Day ISE Auth Bypass (CVSS 10.0) Exploited in Active Attacks	17 Sep 202606:39	–	thn
Vulnrichment	CVE-2026-20331 Cisco Secure Adaptive Security Appliance Software, Secure Firewall Threat Defense Software and Secure Firewall Management Center Software Hardening Release - Protection Mechanism Failure Vulnerabilities	16 Sep 202616:56	–	vulnrichment