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CVE-2026-20152

MEDIUMCVSS 5.3/10EPSS 0.30%

Last modified

CVE-2026-20152 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability in the authentication service feature of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass authentication policy requirements. This vulnerability is due to improper validation of user-supplied authentication input in HTTP requests. An attacker could exploit this vulnerability by sending HTTP requests that contain specific authentication requests to an affected device. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

A vulnerability in the authentication service feature of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass authentication policy requirements. This vulnerability is due to improper validation of user-supplied authentication input in HTTP requests. An attacker could exploit this vulnerability by sending HTTP requests that contain specific authentication requests to an affected device. A successful exploit could allow the attacker to bypass policy enforcement on the device. There is no direct impact to the Cisco Secure Web Appliance. However, as a result of exploiting this vulnerability, an attacker could send HTTP requests that should be restricted through the device.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
0.30%

21.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
CiscoCisco Secure Web Appliance11.8.0-453; 12.5.3-002; 12.0.3-007; 12.0.3-005; 14.1.0-032; 14.1.0-047; 14.1.0-041; 12.0.4-002; 14.0.2-012; 11.8.0-414; 12.0.1-268; 11.8.1-023; 11.8.3-021; 11.8.3-018; 12.5.1-011; 11.8.4-004; 12.5.2-007; 12.5.2-011; 14.5.0-498; 12.5.4-005; 12.5.4-011; 12.0.5-011; 14.0.3-014; 12.5.5-004; 12.5.5-005; 12.5.5-008; 14.0.4-005; 14.5.1-008; 14.5.1-016; 15.0.0-355; 15.0.0-322; 12.5.6-008; 15.1.0-287; 14.5.2-011; 15.2.0-116; 14.0.5-007; 15.2.0-164; 14.5.1-510; 12.0.2-012; 12.0.2-004; 14.5.1-607; 14.5.3-033; 15.0.1-004; 15.2.1-011; 14.5.0-673; 14.5.0-537; 12.0.1-334; 14.0.1-503; 14.0.1-053; 11.8.0-429; 14.0.1-040; 14.0.1-014; 12.5.1-043; 15.2.2-009; 15.2.3-007; 15.2.4-022; 15.2.5-011; 15.2.5-013; 14.6.0-108

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-20152?
A vulnerability in the authentication service feature of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass authentication policy requirements. This vulnerability is due to improper validation of user-supplied authentication input in HTTP requests. An attacker could exploit this vulnerability by sending HTTP requests that contain specific authentication requests to an affected device. A successful exploit could allow the attacker to bypass policy enforcement on the device. There is no direct impact to the Cisco Secure Web Appliance. However, as a result of exploiting this vulnerability, an attacker could send HTTP requests that should be restricted through the device.
How severe is CVE-2026-20152?
CVE-2026-20152 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20152?
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