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CVE-2025-20362

MEDIUM · CVSS 6.5 · Analyzed

Published: 2025-09-25 · Updated: 2026-10-18 · Source: NVD

Vulnerability overview

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 that are affected by CVE-2025-20333 and CVE-2025-20362. This attack can cause unpatched devices to unexpectedly reload, leading to denial of service (DoS) conditions. Cisco strongly recommends that all customers upgrade to the fixed software releases that are listed in the Fixed Software ["#fs"] section of this advisory. 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 unauthenticated, remote attacker to access restricted URL endpoints that are related to remote access VPN that should otherwise be inaccessible without authentication. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on a device. A successful exploit could allow the attacker to access a restricted URL without authentication.

Severity and scoring

CVSS score
6.5 · MEDIUM
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-862

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Listed in CISA’s Known Exploited Vulnerabilities catalog.

Affected product
Cisco · Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense
Added to catalog
2025-09-25
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.
CISA remediation due date
2025-09-26

CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.12

    Before (exclusive): 9.12.4.72

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.14

    Before (exclusive): 9.14.4.28

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.16

    Before (exclusive): 9.16.4.85

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.17.0

    Before (exclusive): 9.18.4.67

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.19

    Before (exclusive): 9.20.4.10

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.22

    Before (exclusive): 9.22.2.14

  • cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

    From (inclusive): 9.23

    Before (exclusive): 9.23.1.19

  • cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*

    From (inclusive): 7.0.0

    Before (exclusive): 7.0.8.1

  • cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*

    From (inclusive): 7.1.0

    Before (exclusive): 7.2.10.2

  • cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*

    From (inclusive): 7.3.0

    Before (exclusive): 7.4.2.4

  • cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*

    From (inclusive): 7.6.0

    Before (exclusive): 7.6.2.1

  • cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*

    From (inclusive): 7.7.0

    Before (exclusive): 7.7.10.1

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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