CVE-2017-12231

HighCVSS 7.5/10Known exploited (CISA KEV)Last modified Jun 17, 2026

Description

A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to the improper translation of H.323 messages that use the Registration, Admission, and Status (RAS) protocol and are sent to an affected device via IPv4 packets. An attacker could exploit this vulnerability by sending a crafted H.323 RAS packet through an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to use an application layer gateway with NAT (NAT ALG) for H.323 RAS messages. By default, a NAT ALG is enabled for H.323 RAS messages. Cisco Bug IDs: CSCvc57217.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-399

Affected software

Vendor	Product	Versions
n/a	Cisco IOS	Cisco IOS

References

http://www.securityfocus.com/bid/101039Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039449Broken Link, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-natVendor Advisory
http://www.securityfocus.com/bid/101039Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039449Broken Link, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-natVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12231US Government Resource

Timeline

Published: Sep 29, 2017
Last modified: Jun 17, 2026
Added to CISA KEV: Mar 3, 2022
NVD status: Analyzed

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