Is CVE-2025-20333 actively exploited?

Yes. KEV Intelligence tracks CVE-2025-20333 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2025-20333. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2025-20333 affects Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure.... KEV Intelligence lists 300 version rows; examples include 9.8.1, 9.8.1.5, and 9.8.1.7.

Yes. CVE-2025-20333 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2025-20333

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Software · 9.8.1

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Severity: CVSS 9.9 · Critical
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 40.4%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-20333 is a vulnerability affecting Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure.... A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.8.1.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

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.

Vendor Product Affected Status

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.0.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.2 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.3 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.4.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.6 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.7 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.5.2 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.2.8.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.3.0 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.3.1.2 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.0 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.1.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.1 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.2 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.4.2.3 Affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software 7.6.0 Affected

Published: 25 Sep 2025
Exploitation Reported: 01 Jun 2026
Attack vector: Remote
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-20333
cisco-sa-asaftd-webvpn-z5xP8EUB sec.cloudapps.cisco.com · CVE Record https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurity...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source	Added
CVE First	2026-06-01 10:41 UTC
CISA	2026-06-02 14:06 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.9 Critical

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

EPSS

40.4%

Weaknesses

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') CWE-120

Timeline

From disclosure to observed exploitation

02 Jun 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
01 Jun 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
25 Sep 2025
CVE published

Vulnerability disclosed publicly
10 Oct 2024
CVE ID reserved

Identifier reserved by the CNA

Pro API

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Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-20333

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2025-20333",
  "confidence": "Confirmed",
  "cvss_score": 9.9,
  "cvss_estimated": false,
  "epss_score": 0.40391,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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CVE-2025-20333

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

Tags

CVE References

Exploited in the wild

Known exploited vulnerability sources

Observed signals

Scanner coverage

Virtual patch status

Weaknesses

Added to CISA KEV

Added to KEV Intelligence KEV Feed

CVE published

CVE ID reserved

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