CRITICALCVSS 9.9Actively exploited · CISA KEV since 2025-09-25Vulnerability

CVE-2025-20333

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.

Properties

Euvd product
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software
Vulnerability name
Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
First seen
2026-02-26T17:47:58+00:00
Cvss score
9.9
Epss score
0.71207
Last seen
2026-10-19T12:00:27+00:00
Due date
2025-09-26
Euvd assigner
cisco
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2025-09-25T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2025-09-25
Euvd base score version
3.1
Score
9.9
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Cisco
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
9.9

Related Entities (12)

MENTIONED_IN (6)

→[Campaign]Active exploitation of Cisco Secure Firewall Management Center vulnerabilities
→[Campaign]Continues building ORB networks using new malware
→[Campaign]Inside an affiliate panel targeting Microsoft 365
→[Campaign]From edge appliance to enterprise compromise: Multi-stage Linux intrusion via F5 and Confluence
→[Campaign]Ongoing exploitation of Cisco Catalyst SD-WAN vulnerabilities
→[Campaign]UAT-8302 and its box full of malware

AFFECTS_PRODUCT (3)

→[Product]cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:cisco:secure_firewall_threat_defense:7.6.0:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

DESCRIBES (1)

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

HAS_WEAKNESS (1)

→[Weakness]Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

INVOLVES (1)

←[Signal]kev_added · 2025-09-25

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CVE-2025-20333 (CVSS 9.9) — Ninja Signal Threat Intelligence | Ninja Signal