CVE-2025-20333CRITICAL 9.9CISA KEVEPSS p97.9%

CVE-2025-20333Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability

Cisco / Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense

Description

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.

Scoring

CVSS 3.19.9 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS29.20% probability of exploitation · percentile 97.9% · 2026-06-18T12:00:27Z
Published2025-09-25
Last modified2025-10-28

CISA KEV entry

Added to KEV: 2025-09-25

Underlying weaknesses· 1

CWE-120

References

  1. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB
  2. https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
  3. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20333

1

TypeTargetConfidenceTier
WeaknessBuffer Copy without Checking Size of Input ('Classic Buffer Overflow')cwe-1200%live

(incoming)1

TypeTargetConfidenceTier
KEVEntryCisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerabilitykev-cve-2025-203330%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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CVE-2025-20263
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Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability
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CVE-2025-20243
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CVE-2025-20133
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CVE-2025-20363
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Cisco ASA and FTD Information Disclosure Vulnerability
Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.