CVE-2017-12231

Known Exploited

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 10.85% Top 10%
KEV Since 
Vendor Advisory cisco.com
Affected: n/a Cisco IOS
Published at:
Updated at:

References

Link Tags
http://www.securitytracker.com/id/1039449 vdb entry third party advisory broken link
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-nat vendor advisory
http://www.securityfocus.com/bid/101039 vdb entry third party advisory broken link

Frequently Asked Questions

What is the severity of CVE-2017-12231?
CVE-2017-12231 has been scored as a high severity vulnerability.
How to fix CVE-2017-12231?
To fix CVE-2017-12231, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-12231 being actively exploited in the wild?
It is confirmed that CVE-2017-12231 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~11% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-12231?
CVE-2017-12231 affects n/a Cisco IOS.
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