Cisco Secure Firewall Threat Defense: Mehrere Schwachstellen
WID-SEC-2026-3423 · first 17.09.2026 · updated 17.09.2026 · CVSS 8,6
What it is about
Cisco Secure Firewall Threat Defense ist eine Sicherheitslösung, die Funktionen wie Firewall, Intrusion Prevention und erweiterten Malware-Schutz in einer einzigen Appliance integriert. Ein Angreifer kann mehrere Schwachstellen in Cisco Secure Firewall Threat Defense ausnutzen, um einen Denial of Service Angriff durchzuführen, um Sicherheitsvorkehrungen zu umgehen, und um seine Privilegien zu erhöhen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
- Sicherheitsvorkehrungen zu umgehen
- seine Privilegien zu erhöhen
Am I affected?
Affected according to the BSI:
- Cisco Secure Firewall Threat Defense
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Cisco Security Advisory cisco-sa-ftd-tls1.3-dos-dLxwFWgF vom 2026-09-16 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-ftd-snort2-ssldos-Mw7WYX9c vom 2026-09-16 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3 vom 2026-09-16 sec.cloudapps.cisco.com
CVE: CVE-2026-20135, CVE-2026-20290, CVE-2026-20295, CVE-2026-20323
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.