Vulnerability in Cisco products (August 12, 2026)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
A vulnerability has been discovered in Cisco products. It allows an attacker to cause remote denial of service. Cisco indicates that the vulnerability CVE-2026-20349 is actively exploited.
CSIRTS triage
- What
- A remote denial of service vulnerability exists in the product.
- Who is affected
- Deployments of Cisco FTD running affected versions.
- Urgency
- High; CVE-2026-20349 is actively exploited.
- Action
- Apply Cisco security patches immediately upon availability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1010/
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.
- Exploitation confirmedCVE-2026-20349Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 56% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20349 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploitedAL26-018 - Vulnerability affecting Cisco ASA and Secure Firewall Threat Defense Software Remote Access SSL VPN…cccs
- unknownexploitedNCSC-2026-0295 [1.00] [M/H] Vulnerability patched in Cisco Secure Firewall ASA and FTD softwarencsc-nl
- unknownexploitedCisco security advisory (AV26-807)cccs
- highexploited[NEW] [high] Cisco ASA (Adaptive Security Appliance) and Secure Firewall Threat Defense: Vulnerability enables…cert-bund
- unknownexploitedCisco Products Multiple Vulnerabilitieshkcert
- highexploitedCVE-2026-20349: A vulnerability in the Remote Access SSL VPN service for Cisco Secure Firewall Adaptive Securi…nvd
- highexploitedCisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SS…cisco-psirt
- highexploitedCISA Adds Three Known Exploited Vulnerabilities to Catalogcisa
- criticalexploitedCVE-2026-20349: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FT…cisa-kev
Recent advisories for Cisco products
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.
- highClamAV Vulnerabilities Affecting Cisco Products: August 2026cisco-psirt · 2026-08-13
- unknownexploitedCisco Products Multiple Vulnerabilitieshkcert · 2026-08-12
- unknownCisco Products Multiple Vulnerabilitieshkcert · 2026-08-06
- unknownMultiple vulnerabilities in Cisco products (August 6, 2026)cert-fr-avis · 2026-08-06
- highCVE-2026-20313: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Cat…nvd · 2026-08-05
- highCVE-2026-20312: As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Cat…nvd · 2026-08-05
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