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.

Published: 2025-09-25 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-20363 is rated High Risk (69.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 7.52%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.08% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-20363

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 6.44% 7.52% +1.08%
2 2026-05-22 2.71% 6.44% +3.74%
3 2026-05-20 — 2.71% —

Full EPSS history (25 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-20363

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 6.0 [email protected]

Weakness enumeration for CVE-2025-20363

Affected software / configurations for CVE-2025-20363

Vendor Product Version Raw CPE
cisco ios_xr 6.5.1 cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:x86:*
cisco ios_xr 6.5.2 cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:x86:*
cisco ios_xr 6.5.3 cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:x86:*
cisco ios_xr 6.6.2 cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:x86:*
cisco ios_xr 6.6.3 cpe:2.3:o:cisco:ios_xr:6.6.3:*:*:*:*:*:x86:*
cisco ios_xr 6.6.25 cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:x86:*
cisco ios_xr 6.7.1 cpe:2.3:o:cisco:ios_xr:6.7.1:*:*:*:*:*:x86:*
cisco ios_xr 6.7.2 cpe:2.3:o:cisco:ios_xr:6.7.2:*:*:*:*:*:x86:*
cisco ios_xr 6.7.3 cpe:2.3:o:cisco:ios_xr:6.7.3:*:*:*:*:*:x86:*
cisco ios_xr 6.8.1 cpe:2.3:o:cisco:ios_xr:6.8.1:*:*:*:*:*:x86:*
cisco ios_xr 6.8.2 cpe:2.3:o:cisco:ios_xr:6.8.2:*:*:*:*:*:x86:*
cisco ios_xr 6.9.1 cpe:2.3:o:cisco:ios_xr:6.9.1:*:*:*:*:*:x86:*
cisco ios_xr 6.9.2 cpe:2.3:o:cisco:ios_xr:6.9.2:*:*:*:*:*:x86:*
cisco adaptive_security_appliance_software >= 9.12, < 9.12.4.72 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.14, < 9.14.4.28 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.16, < 9.16.4.84 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.17.1, < 9.18.4.57 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.19.1, < 9.19.1.42 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.20.1, < 9.20.3.16 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.22, < 9.22.2 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco adaptive_security_appliance_software >= 9.23, < 9.23.1.3 cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cisco ios >= 12.2\(15\)b, <= 15.9\(3\)m11 cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
cisco ios_xe >= 3.2.0sg, <= 17.17.1 cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
cisco firepower_threat_defense >= 7.0.0, < 7.0.8 cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cisco firepower_threat_defense >= 7.1.0, < 7.2.10 cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cisco firepower_threat_defense >= 7.3.0, < 7.4.2.3 cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cisco firepower_threat_defense >= 7.7.0, < 7.7.10 cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cisco firepower_threat_defense 7.6.0 cpe:2.3:a:cisco:firepower_threat_defense:7.6.0:*:*:*:*:*:*:*

References for CVE-2025-20363

cvelogic Threat Intelligence