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Fencer Vulns
critical 9.0

CVE-2025-20363 in the critical feed json

A vulnerability in the web services of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defen…

published 2025-09-25 13 mo ago modified 2026-10-18 21 d ago also EUVD-2025-31138

cvss
9.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
7.2%
EPSS 7.2% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

A vulnerability in the web services of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, remote attacker (Cisco ASA and FTD Software) or authenticated, remote attacker (Cisco IOS, IOS XE, and IOS XR Software) with low user privileges to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web service on an affected device after obtaining additional information about the system, overcoming exploit mitigations, or both. A successful exploit could allow the attacker to execute arbitrary code as root, which may lead to the complete compromise of the affected device. For more information about this vulnerability, see the Details ["#details"] section of this advisory.

Patch / fix

  • cisco secure_firewall_threat_defense 7.0.8, 7.2.10, 7.4.2.3, 7.7.10
  • cisco adaptive_security_appliance_software 9.12.4.72, 9.14.4.28, 9.16.4.84, 9.18.4.57, 9.19.1.42, 9.20.3.16, 9.22.2, 9.23.1.3

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
13 mo ago

Exploit prediction

7.16% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Cisco IOS
  • Cisco Cisco IOS XR Software
  • Cisco Cisco Adaptive Security Appliance (ASA) Software
  • Cisco Cisco IOS XE Software
  • Cisco Cisco Firepower Threat Defense Software

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.