{"id":79718,"date":"2025-10-01T17:30:31","date_gmt":"2025-10-01T17:30:31","guid":{"rendered":""},"modified":"2025-10-06T05:35:33","modified_gmt":"2025-10-06T11:35:33","slug":"cve-2025-20363-critical-web-services-vulnerability-in-cisco-secure-firewall-and-ios-software","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20363-critical-web-services-vulnerability-in-cisco-secure-firewall-and-ios-software\/","title":{"rendered":"CVE-2025-20363: Critical Web Services Vulnerability in Cisco Secure Firewall and IOS Software<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

In the ever-evolving realm of cybersecurity, a new critical vulnerability, CVE-2025-20363, has been identified in several Cisco software products, including 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. This vulnerability, if left unaddressed, allows an unauthenticated, remote attacker to execute arbitrary code on the affected device, potentially leading to a full system compromise.
\nThis vulnerability is particularly noteworthy due<\/a> to its high severity score and the widespread usage of the affected Cisco Software, which makes it a potential target for cybercriminals aiming to gain unauthorized access to networks and data. Mitigation and patching should be prioritized to prevent any possible exploitation.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-20363
\nSeverity: Critical (CVSS: 9.0)
\nAttack Vector: Network
\nPrivileges Required: None for Cisco ASA and FTD Software; Low for Cisco IOS, IOS XE, and IOS XR Software
\nUser Interaction: None
\nImpact: Execution of arbitrary code<\/a> as root, potentially leading to complete system compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | All versions prior to patch
\nCisco Secure Firewall Threat Defense (FTD) Software | All versions prior to patch
\nCisco IOS Software | All versions prior to patch
\nCisco IOS XE Software | All versions prior to patch
\nCisco IOS XR Software | All versions prior to patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability stems from the improper validation of user-supplied input in HTTP requests by the web<\/a> services of the affected Cisco software. A successful exploit is achieved by an attacker sending a specially crafted HTTP request to a targeted web<\/a> service on an affected device.
\nThe attacker could potentially gain additional system information, overcome exploit mitigations, or both, thereby allowing them to execute arbitrary code<\/a> as root. This could lead to the attacker gaining total control of the affected device.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual example of how the vulnerability might be exploited via a malicious HTTP request:<\/a><\/p>\n

POST \/vulnerable\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ \"malicious_payload\": \"base64_encoded_exploit_code_here\" }<\/code><\/pre>\n
In this example, a malicious payload is sent to a vulnerable endpoint<\/a> on the target device. This payload, if processed by the vulnerable system, could lead to arbitrary code execution<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In the ever-evolving realm of cybersecurity, a new critical vulnerability, CVE-2025-20363, has been identified in several Cisco software products, including 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. This vulnerability, if left unaddressed, allows an […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[77,96],"product":[97],"attack_vector":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-79718","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-apple","vendor-cisco","product-cisco-ios-xe","attack_vector-rce"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t