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CVE-2025-20363

CRITICALCVSS 9/10EPSS 7.52%

Last modified

CVE-2025-20363 is a critical-severity vulnerability rated 9/10 on the CVSS scale. 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. EPSS estimates a 7.52% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
7.52%

93.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xr6.5.1
CiscoIos Xr6.5.2
CiscoIos Xr6.5.3
CiscoIos Xr6.6.2
CiscoIos Xr6.6.3
CiscoIos Xr6.6.25
CiscoIos Xr6.7.1
CiscoIos Xr6.7.2
CiscoIos Xr6.7.3
CiscoIos Xr6.8.1
CiscoIos Xr6.8.2
CiscoIos Xr6.9.1
CiscoIos Xr6.9.2
CiscoAdaptive Security Appliance Software>= 9.12, < 9.12.4.72
CiscoAdaptive Security Appliance Software>= 9.14, < 9.14.4.28
CiscoAdaptive Security Appliance Software>= 9.16, < 9.16.4.84
CiscoAdaptive Security Appliance Software>= 9.17.1, < 9.18.4.57
CiscoAdaptive Security Appliance Software>= 9.19.1, < 9.19.1.42
CiscoAdaptive Security Appliance Software>= 9.20.1, < 9.20.3.16
CiscoAdaptive Security Appliance Software>= 9.22, < 9.22.2
CiscoAdaptive Security Appliance Software>= 9.23, < 9.23.1.3
CiscoIos>= 12.2\(15\)b, <= 15.9\(3\)m11
CiscoIos Xe>= 3.2.0sg, <= 17.17.1
CiscoFirepower Threat Defense>= 7.0.0, < 7.0.8
CiscoFirepower Threat Defense>= 7.1.0, < 7.2.10
CiscoFirepower Threat Defense>= 7.3.0, < 7.4.2.3
CiscoFirepower Threat Defense>= 7.7.0, < 7.7.10
CiscoFirepower Threat Defense7.6.0

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2025-20363?
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.
How severe is CVE-2025-20363?
CVE-2025-20363 has a CVSS score of 9/10 (CRITICAL severity). The EPSS model estimates a 7.52% probability of exploitation in the next 30 days.
How do I fix CVE-2025-20363?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST