CVE-2025-20196

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-07 · updated 2026-06-17
Weakness: CWE-307

Description

A vulnerability in the Cisco IOx application hosting environment of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the Cisco IOx application hosting environment to stop responding, resulting in a denial of service (DoS) condition. This vulnerability is due to the improper handling of HTTP requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the Cisco IOx application hosting environment to stop responding. The IOx process will need to be manually restarted to recover services.

Affected products

Cisco 807 Industrial Integrated Services Router Firmware: before 15.9\(3\)m11 — fixed in 15.9\(3\)m11
Cisco 809 Industrial Integrated Services Router Firmware: before 15.9\(3\)m11 — fixed in 15.9\(3\)m11
Cisco 829 Industrial Integrated Services Router Firmware: before 15.9\(3\)m11 — fixed in 15.9\(3\)m11
Cisco Cgr1000 Firmware: before 15.9\(3\)m12 — fixed in 15.9\(3\)m12
Cisco IC3000 Industrial Compute Gateway: before 1.5.2 — fixed in 1.5.2
Cisco IOS XE: before 17.15.2; 16.1.1, 16.1.2, 16.1.3, 16.2.1, 16.2.2, 16.3.1 (+131) — fixed in 17.15.2
Cisco Ir510 Wpan Firmware: all versions

How to fix

Upgrade to a fixed version: Cisco 807 Industrial Integrated Services Router Firmware 15.9\(3\)m11; Cisco 809 Industrial Integrated Services Router Firmware 15.9\(3\)m11; Cisco 829 Industrial Integrated Services Router Firmware 15.9\(3\)m11; Cisco Cgr1000 Firmware 15.9\(3\)m12; Cisco IC3000 Industrial Compute Gateway 1.5.2; Cisco IOS XE 17.15.2. Check the vendor advisory for mitigations.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iox-dos-95Fqnf7b

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