TI-2018-00441 Aliases CVE-2018-0484 GHSA-wpcx-9mmv-mm42

Cisco IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability

LOW 36CWE-284Published 2019-01-10 · Updated 2024-11-19

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-284.

Summary

A vulnerability in the access control logic of the Secure Shell (SSH) server of Cisco IOS and IOS XE Software may allow connections sourced from a virtual routing and forwarding (VRF) instance despite the absence of the vrf-also keyword in the access-class configuration. The vulnerability is due to a missing check in the SSH server. An attacker could use this vulnerability to open an SSH connection to an affected Cisco IOS or IOS XE device with a source address belonging to a VRF instance. Once connected, the attacker would still need to provide valid credentials to access the device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00788 56th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco IOS	all versions	—	No fix listed	CNA

Cisco IOS VendorCisco Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:ios:16.6.2:::::::*	16.6.2	Vulnerable	Cisco
cpe:2.3:o:cisco:ios:16.6.4:::::::*	16.6.4	Vulnerable	Cisco

cpe:2.3:o:cisco:ios:16.6.2:*:*:*:*:*:*:* Versions 16.6.2 Vulnerable ·Cisco
cpe:2.3:o:cisco:ios:16.6.4:*:*:*:*:*:*:* Versions 16.6.4 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2018-0484
2026-10-03 Alias added: GHSA-wpcx-9mmv-mm42

References

Advisory 1

20190109 Cisco IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability

TI-2018-00138 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
TI-2017-09019 Improper input validation in Cisco IOS and IOS XE KEVCVSS 3.1CRITICAL 9.8
TI-2017-02977 Improper input validation in Cisco IOS and IOS XE Software KEVCVSS 3.1CRITICAL 9.8
TI-2018-00135 Memory corruption in Cisco IOS, IOS XE, and IOS XR KEVCVSS 3.1HIGH 8.8
TI-2017-04499 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
TI-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8

See all 617 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences