[Update] Multiple vulnerabilities in Cisco ASA and FTD (September 25, 2025)

unknownpublic exploitCVE-2025-20333 CVE-2025-20362

[Update on November 7, 2025] On November 5, 2025, Cisco updated its blog post originally published on September 25, 2025 (see Documentation section). The vendor states it is aware of a new attack affecting vulnerable ASA and FTD devices, causing a denial...

CSIRTS triage

vendor: Cisco product: ASA and FTD Denial of service

What: A new attack affecting vulnerable ASA and FTD devices has been reported, causing denial of service.
Who is affected: Users of Cisco ASA and FTD devices are affected.
Urgency: Remediation is important as the vulnerability is actively exploited.
Action: Follow Cisco's updated guidance for mitigation.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Alertes de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2025-09-25
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/alerte/CERTFR-2025-ALE-013/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Elevated exploitation riskCVE-2025-2033340.4% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 98% of all scored CVEs.
Exploitation likely imminentCVE-2025-20362EPSS puts this in the most-targeted tier (85.5% 30-day exploitation probability). Prioritize alongside KEV items. Riskier than 100% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-20333	coverage & exploitation status	NVD · CVE.org
CVE-2025-20362	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedContinued Evolution of Persistence Mechanism Against Cisco Secure Firewall Adaptive Security Appliance and Sec…cisco-psirt
criticalexploitedCVE-2025-20362: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FT…cisa-kev
criticalexploitedCVE-2025-20333: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FT…cisa-kev

Recent advisories for Cisco ASA and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalexploitedCVE-2025-20362: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FT…cisa-kev · 2025-09-25
criticalexploitedCVE-2025-20333: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FT…cisa-kev · 2025-09-25
criticalexploitedCVE-2014-2120: Cisco Adaptive Security Appliance (ASA) Cross-Site Scripting (XSS) Vulnerabilitycisa-kev · 2024-11-12
criticalexploitedCVE-2024-20481: Cisco ASA and FTD Denial-of-Service Vulnerabilitycisa-kev · 2024-10-24
criticalexploitedCVE-2024-20359: Cisco ASA and FTD Privilege Escalation Vulnerabilitycisa-kev · 2024-04-24
criticalexploitedCVE-2024-20353: Cisco ASA and FTD Denial of Service Vulnerabilitycisa-kev · 2024-04-24