TI-2018-00155 Aliases CVE-2018-0189 GHSA-xhgx-g6j2-m588

Resource management flaw in Cisco IOS and IOS XE

LOW 26CWE-399Published 2018-03-28 · Updated 2024-12-02

Key facts

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

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.

Summary

A vulnerability in the Forwarding Information Base (FIB) code of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, network attacker to cause a denial of service (DoS) condition. The vulnerability is due to a limitation in the way the FIB is internally representing recursive routes. An attacker could exploit this vulnerability by injecting routes into the routing protocol that have a specific recursive pattern. The attacker must be in a position on the network that provides the ability to inject a number of recursive routes with a specific pattern. An exploit could allow the attacker to cause an affected device to reload, creating a DoS condition. Cisco Bug IDs: CSCva91655.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00996 62nd 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: No
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 IOS and IOS XE	Cisco IOS and IOS XE	—	No fix listed	CNA

Cisco IOS and IOS XE Vendor— Affected Cisco IOS and IOS XE Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:ios_xe::::::::	before 15.5\(3\)s5; before 15.5\(3\)m5; before 15.4\(3\)s7; before 15.4\(2\)s1; before 15.4\(1\)s1; before 15.4\(1\)s0a; before 15.2\(5\)e1; before 15.2\(4\)e5; before 15.2\(2\)e1; before 15.2\(1\)e1	Vulnerable	Cisco

cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* Versions before 15.5\(3\)s5; before 15.5\(3\)m5; before 15.4\(3\)s7; before 15.4\(2\)s1; before 15.4\(1\)s1; before 15.4\(1\)s0a; before 15.2\(5\)e1; before 15.2\(4\)e5; before 15.2\(2\)e1; before 15.2\(1\)e1 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2018-0189
2026-10-03 Alias added: GHSA-xhgx-g6j2-m588

References

Advisory 1

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-FIB-dos

TI-2023-06904 Cisco is providing an update for the ongoing investigation into observed exploitation of… KEVCVSS 3.1CRITICAL 10.0
TI-2018-00122 Memory corruption 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-2017-04498 Memory corruption in Cisco IOS KEVCVSS 3.1HIGH 8.8
TI-2017-04497 Memory corruption in Cisco IOS XE Software KEVCVSS 3.1HIGH 8.8

See all 561 →

Sources

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