CVE-2018-0476

Name: CVE-2018-0476
Creator: NVD / NIST
Published: 2018-10-05T14:29:05.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 13.70%

Last modified Jun 17, 2026

CVE-2018-0476 is a vulnerability of currently unknown severity. A vulnerability in the Network Address Translation (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper processing of SIP packets in transit while NAT is performed on an affected device. EPSS estimates a 13.70% chance of exploitation in the next 30 days.

Description

A vulnerability in the Network Address Translation (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper processing of SIP packets in transit while NAT is performed on an affected device. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets via UDP port 5060 through an affected device that is performing NAT for SIP packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Metrics

EPSS Probability

13.70%

96.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Cisco	Ios Xe	15.5\(3\)s5.1
Cisco	Ios Xe	15.5\(3\)s6.1
Cisco	Ios Xe	16.6.2

References

http://www.securityfocus.com/bid/105419Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041734Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041737Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-sip-algVendor Advisory
http://www.securityfocus.com/bid/105419Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041734Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041737Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-sip-algVendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2018-0476?

How severe is CVE-2018-0476?

Severity scoring for CVE-2018-0476 is pending analysis. The EPSS model estimates a 13.70% probability of exploitation in the next 30 days.

How do I fix CVE-2018-0476?

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-2018-0476?

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

Scan your code now

Source: NVD / NIST