CVE-2025-20362KEV · OVERDUECWE-862broken-access-control

Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability

Medium · published September 25, 2025

Patch now

The score understates this — it's already being exploited

CVSS calls it medium at 6.5. It is confirmed in active exploitation. It sits in the 99.8th percentile for exploit probability.

393
days past CISA
deadline
CVSS v3.1
6.5
EPSS
87%
Percentile
99.8
In the wild
Confirmed
What it is

⚠️ A crafty little vulnerability lets remote attackers peek behind the curtain! With just a few crafted HTTP requests, they could access restricted VPN endpoints without a password. 🔍 Think of it like a bouncer at a fancy club accepting fake IDs. Instead of turning away unauthorized guests, the system is letting them waltz right in, bypassing security entirely. If exploited, an attacker could gain access to sensitive VPN endpoints, potentially leading to unauthorized data access or even a denial of service, causing the device to unexpectedly reload. This could leave your network vulnerable and disrupt essential services, which is absolutely devastating! 🔥

Put simply

Think of it like a bouncer at a fancy club accepting fake IDs. Instead of turning away unauthorized guests, the system is letting them waltz right in, bypassing security entirely. This vulnerability arises from improper validation of user-supplied input in HTTP(S) requests to the Cisco Secure ASA and FTD Software, allowing unauthenticated attackers to access restricted URLs that should otherwise require authentication.

What to do

If exploited, an attacker could gain access to sensitive VPN endpoints, potentially leading to unauthorized data access or even a denial of service, causing the device to unexpectedly reload. This could leave your network vulnerable and disrupt essential services, which is absolutely devastating! 🔥 Upgrade to the fixed software versions listed in the advisory immediately. Regularly audit your network configurations and ensure your firewall settings are correctly set to mitigate such vulnerabilities. Stay vigilant! 🛡️ You’ve got this! Take these steps, and you'll be one step closer to thwarting the bad guys! 🚀

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.87085 · 99.8th percentile
Weakness
CWE-862 · Missing Authorization
Published
2025-09-25T20:15Z
KEV added
2025-09-25 · due 2025-09-26
Affected products (12)
ProductVersionsFixed in
cisco/adaptive_security_appliance_software≥ 9.12, < 9.12.4.729.12.4.72
cisco/adaptive_security_appliance_software≥ 9.14, < 9.14.4.289.14.4.28
cisco/adaptive_security_appliance_software≥ 9.16, < 9.16.4.859.16.4.85
cisco/adaptive_security_appliance_software≥ 9.17.0, < 9.18.4.679.18.4.67
cisco/adaptive_security_appliance_software≥ 9.19, < 9.20.4.109.20.4.10
cisco/adaptive_security_appliance_software≥ 9.22, < 9.22.2.149.22.2.14
cisco/adaptive_security_appliance_software≥ 9.23, < 9.23.1.199.23.1.19
cisco/secure_firewall_threat_defense≥ 7.0.0, < 7.0.8.17.0.8.1
cisco/secure_firewall_threat_defense≥ 7.1.0, < 7.2.10.27.2.10.2
cisco/secure_firewall_threat_defense≥ 7.3.0, < 7.4.2.47.4.2.4
cisco/secure_firewall_threat_defense≥ 7.6.0, < 7.6.2.17.6.2.1
cisco/secure_firewall_threat_defense≥ 7.7.0, < 7.7.10.17.7.10.1
References (3)
EPSS history
Timeline
  • 25 SEP 16:12Z
    Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA Software or Cisco Secure FTD Software releases…
    cvelistv5
  • 25 SEP 00:00Z
    Added to CISA KEV — remediate by Sep 26
    kev