A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device.
This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
References
| Link | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB | Vendor Advisory |
| https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks | Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333 | US Government Resource |
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
28 Oct 2025, 13:58
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| References | () https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333 - US Government Resource |
21 Oct 2025, 23:16
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| References |
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21 Oct 2025, 20:20
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21 Oct 2025, 19:21
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| References |
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26 Sep 2025, 14:08
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| CPE | cpe:2.3:a:cisco:firepower_threat_defense:7.6.0:*:*:*:*:*:*:* cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:* |
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| References | () https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB - Vendor Advisory | |
| References | () https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks - Vendor Advisory | |
| First Time |
Cisco
Cisco adaptive Security Appliance Software Cisco firepower Threat Defense |
25 Sep 2025, 18:15
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| References |
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25 Sep 2025, 16:15
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| New CVE |
Information
Published : 2025-09-25 16:15
Updated : 2025-10-28 13:58
NVD link : CVE-2025-20333
Mitre link : CVE-2025-20333
CVE.ORG link : CVE-2025-20333
JSON object : View
Products Affected
cisco
- adaptive_security_appliance_software
- firepower_threat_defense
CWE
CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')