CVE-2018-15398

Name: CVE-2018-15398
Creator: NVD / NIST
Published: 2018-10-05T14:29:08.23+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.88%

Last modified Jun 17, 2026

CVE-2018-15398 is a vulnerability of currently unknown severity. A vulnerability in the per-user-override feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass an access control list (ACL) that is configured for an interface of an affected device. The vulnerability is due to errors that could occur when the affected software constructs and applies per-user-override rules. EPSS estimates a 1.88% chance of exploitation in the next 30 days.

Description

A vulnerability in the per-user-override feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass an access control list (ACL) that is configured for an interface of an affected device. The vulnerability is due to errors that could occur when the affected software constructs and applies per-user-override rules. An attacker could exploit this vulnerability by connecting to a network through an affected device that has a vulnerable configuration. A successful exploit could allow the attacker to access resources that are behind the affected device and would typically be protected by the interface ACL.

Metrics

EPSS Probability

1.88%

76.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Cisco	Adaptive Security Appliance Software	9.6\(4.3\)
Cisco	Adaptive Security Appliance Software	9.4\(2\)
Cisco	Adaptive Security Appliance Software	9.4\(4\)
Cisco	Firepower Threat Defense	6.2.0

References

http://www.securityfocus.com/bid/105517Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041788Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-asa-acl-bypassVendor Advisory
http://www.securityfocus.com/bid/105517Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041788Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-asa-acl-bypassVendor Advisory

Timeline

Published: Oct 5, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-15398?

How severe is CVE-2018-15398?

Severity scoring for CVE-2018-15398 is pending analysis. The EPSS model estimates a 1.88% probability of exploitation in the next 30 days.

How do I fix CVE-2018-15398?

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.

Are you affected by CVE-2018-15398?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST