Arbitrary Code Execution Vulnerability in Cisco Secure Firewall ASA and FTD Software
CVE-2025-20333

9.9CRITICAL

Key Information:

Vendor

Cisco
Status
Cisco Adaptive Security Appliance (asa) Software
Cisco Firepower Threat Defense Software
Vendor
CVE Published:
25 September 2025

Badges

👾 Exploit Exists📰 News Worthy

What is CVE-2025-20333?

A vulnerability exists in the VPN web server component of Cisco Secure Firewall Adaptive Security Appliance and Threat Defense Software. This flaw permits an authenticated, remote attacker to execute arbitrary code on the implicated device due to improper validation of user-supplied input in HTTP(S) requests. Attackers possessing valid VPN credentials can exploit this issue by dispatching specially crafted HTTP requests, potentially leading to the complete compromise of the device.

Affected Version(s)

Cisco Adaptive Security Appliance (ASA) Software 9.8.1

Cisco Adaptive Security Appliance (ASA) Software 9.8.1.5

Cisco Adaptive Security Appliance (ASA) Software 9.8.1.7

News Articles

favicon imageThe Hacker News

Urgent: Cisco ASA Zero-Day Duo Under Attack; CISA Triggers Emergency Mitigation Directive

Cisco ASA zero-days CVE-2025-20333 and 20362 exploited; CISA issues ED 25-03 for urgent patching.

3 hours ago

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
9.9
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • 📰

    First article discovered by The Hacker News

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-20333 : Arbitrary Code Execution Vulnerability in Cisco Secure Firewall ASA and FTD Software