Vulnerability Monitor

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CVE-2016-6438

A vulnerability in Cisco IOS XE Software running on Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause a configuration integrity change to the vty line configuration on an affected device. This vulnerability affects the following releases of Cisco IOS XE Software running on Cisco cBR-8 Converged Broadband Routers: All 3.16S releases, All 3.17S releases, Release 3.18.0S, Release 3.18.1S, Release 3.18.0SP. More Information: CSCuz62815. Known Affected Releases: 15.5(3)S2.9, 15.6(2)SP. Known Fixed Releases: 15.6(1.7)SP1, 16.4(0.183), 16.5(0.1).

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.9, indicating it can be exploited remotely over the network but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts integrity (unauthorized modifications), for affected systems. Impacting 1 product from cisco organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2016, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2016-10-27T21:59:09.810

Last Modified

2026-06-17T00:51:01.943

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 5.9 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-264

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cisco	ios_xe	3.16.0cs	Yes
Operating System	cisco	ios_xe	3.16.0s	Yes
Operating System	cisco	ios_xe	3.16.1as	Yes
Operating System	cisco	ios_xe	3.16.1s	Yes
Operating System	cisco	ios_xe	3.16.2as	Yes
Operating System	cisco	ios_xe	3.16.2bs	Yes
Operating System	cisco	ios_xe	3.16.2s	Yes
Operating System	cisco	ios_xe	3.16.3as	Yes
Operating System	cisco	ios_xe	3.16.3s	Yes
Operating System	cisco	ios_xe	3.16.4s	Yes
Operating System	cisco	ios_xe	3.17.0s	Yes
Operating System	cisco	ios_xe	3.17.1as	Yes
Operating System	cisco	ios_xe	3.17.1s	Yes
Operating System	cisco	ios_xe	3.17.2s	Yes
Operating System	cisco	ios_xe	3.18.0s	Yes
Operating System	cisco	ios_xe	3.18.0sp	Yes
Operating System	cisco	ios_xe	3.18.1s	Yes

References

http://www.securityfocus.com/bid/93518 ([email protected])
http://www.securitytracker.com/id/1037003 ([email protected])
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161012-cbr-8 Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/93518 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1037003 (af854a3a-2127-422b-91ae-364da2661108)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161012-cbr-8 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.