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Vulnerabilities CVE-2025-20333

CVE-2025-20333

Medium
Open
KEV
TLP:CLEAR

Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability

NVD CVE.org

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Description

Cisco — Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense — Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362.

Details

EPSS Score ⓘ
40.39%

98.5th percentile

Confidence
100%
CISA KEV
Date Added
Sep 25, 2025
Patch Due
Sep 26, 2025
Required Action
The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
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