CVE-2025-20243HIGH 8.6EPSS p41.4%

CVE-2025-20243CVE-2025-20243

Description

A vulnerability in the management and VPN web servers of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability is due to improper validation of user-supplied input on an interface with VPN web services. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on an affected device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

Scoring

CVSS 3.18.6 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS0.55% probability of exploitation · percentile 41.4% · 2026-06-19T12:03:05Z
Published2025-08-14
Last modified2026-04-15

Underlying weaknesses· 1

CWE-835

References

  1. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-mfPekA6e

1

TypeTargetConfidenceTier
WeaknessLoop with Unreachable Exit Condition ('Infinite Loop')cwe-8350%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.