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CVE-2025-20333

CRITICALCVSS 9.9/10Actively ExploitedEPSS 40.39%

Last modified

CVE-2025-20333 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 40.39% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.9/10

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

EPSS Probability
40.39%

98.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
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, < 9.16.4.85
CiscoAdaptive Security Appliance Software>= 9.17.0, < 9.17.1.45
CiscoAdaptive Security Appliance Software>= 9.18, < 9.18.4.47
CiscoAdaptive Security Appliance Software>= 9.19, < 9.19.1.37
CiscoAdaptive Security Appliance Software>= 9.20, < 9.20.3.7
CiscoAdaptive Security Appliance Software>= 9.22, < 9.22.1.3
CiscoFirepower Threat Defense>= 7.0.0, < 7.0.8.1
CiscoFirepower Threat Defense>= 7.1.0, < 7.2.9
CiscoFirepower Threat Defense>= 7.3.0, < 7.4.2.4
CiscoFirepower Threat Defense7.6.0

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2025-20333?
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.
How severe is CVE-2025-20333?
CVE-2025-20333 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 40.39% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2025-20333?
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.

Are you affected by CVE-2025-20333?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST