Cisco ASA/FTD/FMC flaws exploited in wild
Cisco patched eight Secure Firewall ASA, FTD and FMC vulnerabilities; two access-control bugs are already being actively exploited.
Sourceadvisories.ncsc.nl — open the original
What to check
- Applies to
- The 10 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-20079 and CVE-2026-20316 as exploited in the wild.
NCSC-NL re-published a Cisco hardening advisory covering eight CVEs across Secure Firewall ASA, Threat Defense (FTD) and Management Center (FMC) software. The flaws span insufficient access control, improper input handling, security mechanism failures and improper exception handling. Four of the eight CVEs carry a CVSS score of 9.0 or higher, with CVE-2026-20329 and CVE-2026-20330 rated 9.9 and exploitable remotely with low privileges and no user interaction. CVE-2026-20331 (9.6) and CVE-2026-20332 (9.0) involve security-mechanism and access-control weaknesses.
Cisco confirmed active exploitation of two previously separately disclosed access-control vulnerabilities in Secure FMC: CVE-2026-20079, which allows authentication bypass, and CVE-2026-20316, which allows access using hard-coded/static credentials. NCSC-NL had already issued separate advisories for these two. The remaining six CVEs in this hardening release are not reported as actively exploited at this time.
Defenders running Cisco Secure Firewall ASA, FTD or FMC should prioritize applying Cisco's hardening update immediately, particularly for FMC instances, given confirmed in-the-wild exploitation of the authentication-bypass and hard-coded-credential flaws. Given the severity scores and remote, low-complexity exploitability of several issues, patching should be treated as urgent across the full product set.
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0458.html
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