CVE-2018-0476

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.

• CWE-399

• 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

Published

Oct 5, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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