CVE Tools
Sign in

CVE-2017-12231

Published: Sep 28, 2017Updated: Apr 21, 2026 Sources: CVE List NVD BDUCWE-399
7.5HIGH
NVD MITRE
EPSS Score
7.1%
Top 6.1%
CISA KEV
Active Exploitation
Since Mar 3, 2022
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-399NVD-CWE-noinfo

Affected Products

Cisco Systems Inc.
commercial·USaka cisco, cisco systems
Cisco IOSOn-premFirmware
Networking Infrastructure / router-switch
and 2 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Mar 3, 2022
Remediation due:Mar 24, 2022

Required action: Apply updates per vendor instructions.

Official Patch Available
Is your org exposed to CVE-2017-12231?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

http://www.securityfocus.com/bid/101039
securityfocus.com
http://www.securitytracker.com/id/1039449
securitytracker.com
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-nat
tools.cisco.com
and 4 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2017-12231 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows