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CVE-2025-20362

HIGHCVSS 8.6/10Actively ExploitedEPSS 85.54%

Last modified

CVE-2025-20362 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 85.54% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.6/10

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

EPSS Probability
85.54%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software>= 9.12, < 9.12.4.72
CiscoAdaptive Security Appliance Software>= 9.14, < 9.14.4.28
CiscoAdaptive Security Appliance Software>= 9.16, < 9.16.4.85
CiscoAdaptive Security Appliance Software>= 9.17.0, < 9.18.4.67
CiscoAdaptive Security Appliance Software>= 9.19, < 9.20.4.10
CiscoAdaptive Security Appliance Software>= 9.22, < 9.22.2.14
CiscoAdaptive Security Appliance Software>= 9.23, < 9.23.1.19
CiscoFirepower Threat Defense>= 7.0.0, < 7.0.8.1
CiscoFirepower Threat Defense>= 7.1.0, < 7.2.10.2
CiscoFirepower Threat Defense>= 7.3.0, < 7.4.2.4
CiscoFirepower Threat Defense>= 7.6.0, < 7.6.2.1
CiscoFirepower Threat Defense>= 7.7.0, < 7.7.10.1

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2025-20362?
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.
How severe is CVE-2025-20362?
CVE-2025-20362 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 85.54% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2025-20362?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST