CVE-2025-20363 remediation guide

Cisco IOS, Cisco IOS XR Software, Cisco Adaptive Security Appliance (ASA) Software

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 sendin...

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ProductCisco IOS, Cisco IOS XR Software, Cisco Adaptive Security Appliance (ASA) Software

Affected versions>= 12.2(15)B, >= 12.2(16)B1, >= 12.2(16)B2, >= 12.2(16)B, >= 12.2(15)BC2a, >= 12.2(15)BC1a, >= 12.2(15)BC1b, >= 12.2(15)BC2d, >= 12.2(15)BC2g, >= 12.2(15)BC1g, >= 12.2(15)BC2i, >= 12.2(15)BC1c, >= 12.2(15)BC2c, >= 12.2(15)BC2f, >= 12.2(15)BC1d, >= 12.2(15)BC1, >= 12.2(15)BC2, >= 12.2(15)BC2e, >= 12.2(15)BC1e, >= 12.2(15)BC2h

Fixed versions9.12.4.72, 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, 7.0.8, 7.2.10, 7.4.2.3, 7.7.10

Priority basisReview · CVSS 9 · EPSS 7.52%

Identify the affected asset

Confirm whether Cisco IOS, Cisco IOS XR Software, Cisco Adaptive Security Appliance (ASA) Software is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 12.2(15)B, >= 12.2(16)B1, >= 12.2(16)B2, >= 12.2(16)B, >= 12.2(15)BC2a, >= 12.2(15)BC1a, >= 12.2(15)BC1b, >= 12.2(15)BC2d, >= 12.2(15)BC2g, >= 12.2(15)BC1g, >= 12.2(15)BC2i, >= 12.2(15)BC1c, >= 12.2(15)BC2c, >= 12.2(15)BC2f, >= 12.2(15)BC1d, >= 12.2(15)BC1, >= 12.2(15)BC2, >= 12.2(15)BC2e, >= 12.2(15)BC1e, >= 12.2(15)BC2h. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 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, 7.0.8, 7.2.10, 7.4.2.3, 7.7.10. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.