CVE-2018-0353

Name: CVE-2018-0353
Creator: NVD / NIST
Published: 2018-06-07T12:29:00.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.89%

Last modified Jun 17, 2026

CVE-2018-0353 is a vulnerability of currently unknown severity. A vulnerability in traffic-monitoring functions in Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to circumvent Layer 4 Traffic Monitor (L4TM) functionality and bypass security protections. The vulnerability is due to a change in the underlying operating system software that is responsible for monitoring affected traffic. EPSS estimates a 3.89% chance of exploitation in the next 30 days.

Description

A vulnerability in traffic-monitoring functions in Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to circumvent Layer 4 Traffic Monitor (L4TM) functionality and bypass security protections. The vulnerability is due to a change in the underlying operating system software that is responsible for monitoring affected traffic. An attacker could exploit this vulnerability by sending crafted IP packets to an affected device. A successful exploit could allow the attacker to pass traffic through the device, which the WSA was configured to deny. This vulnerability affects both IPv4 and IPv6 traffic. This vulnerability affects Cisco AsyncOS versions for WSA on both virtual and hardware appliances running any release of the 10.5.1, 10.5.2, or 11.0.0 WSA Software. The WSA is vulnerable if it is configured for L4TM. Cisco Bug IDs: CSCvg78875.

Metrics

EPSS Probability

3.89%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-254

Affected Software

Vendor	Product	Versions
Cisco	Web Security Appliance	10.5.1
Cisco	Web Security Appliance	10.5.1-296
Cisco	Web Security Appliance	10.5.2
Cisco	Web Security Appliance	11.0.0
Cisco	Web Security Appliance	11.5.0-fcs-442

References

http://www.securityfocus.com/bid/104417Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041081Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-wsaVendor Advisory
http://www.securityfocus.com/bid/104417Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041081Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-wsaVendor Advisory

Timeline

Published: Jun 7, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-0353?

How severe is CVE-2018-0353?

Severity scoring for CVE-2018-0353 is pending analysis. The EPSS model estimates a 3.89% probability of exploitation in the next 30 days.

How do I fix CVE-2018-0353?

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-2018-0353?

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

Scan your code now

Source: NVD / NIST