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.
Published 2017-09-29 01:34:49
Updated 2019-10-09 23:22:33
View at NVD,   CVE.org
Vulnerability category: Denial of service

CVE-2017-12231 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
Cisco IOS Software Network Address Translation Denial-of-Service Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS could allow an unauthenticated, remote attacker to cause a denial of service.
Added on 2022-03-03 Action due date 2022-03-24

Exploit prediction scoring system (EPSS) score for CVE-2017-12231

0.36%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-12231

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.8
HIGH AV:N/AC:L/Au:N/C:N/I:N/A:C
10.0
6.9
NIST
7.5
HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST

CWE ids for CVE-2017-12231

  • Assigned by: ykramarz@cisco.com (Secondary)

References for CVE-2017-12231

Products affected by CVE-2017-12231

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