TI-2018-00125 Aliases CVE-2018-0155 GHSA-qmg7-32mc-92p9

Improper handling of exceptional conditions in Cisco IOS and IOS XE

CRITICAL 94Exploited in the wildCWE-388Published 2018-03-28 · Updated 2026-01-12

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to cause a crash of the iosd process, causing a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when the BFD header in a BFD packet is incomplete. An attacker could exploit this vulnerability by sending a crafted BFD message to or across an affected switch. A successful exploit could allow the attacker to trigger a reload of the system. This vulnerability affects Catalyst 4500 Supervisor Engine 6-E (K5), Catalyst 4500 Supervisor Engine 6L-E (K10), Catalyst 4500 Supervisor Engine 7-E (K10), Catalyst 4500 Supervisor Engine 7L-E (K10), Catalyst 4500E Supervisor Engine 8-E (K10), Catalyst 4500E Supervisor Engine 8L-E (K10), Catalyst 4500E Supervisor Engine 9-E (K10), Catalyst 4500-X Series Switches (K10), Catalyst 4900M Switch (K5), Catalyst 4948E Ethernet Switch (K5). Cisco Bug IDs: CSCvc40729.

Why it matters now

Exploitation Active In CISA KEV since 2022-03-03CISA due date 2022-03-17

EPSS 0.07742 94th 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: Active
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 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 · 13

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:ios:3.6\(2\)e:::::::*	3.6(2)e	Vulnerable	Cisco
cpe:2.3:o:cisco:ios_xe:3.6\(2\)e:::::::*	3.6(2)e	Vulnerable	Cisco
cpe:2.3:h:cisco:catalyst_4500-x_series_switches_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_6-e_\(k5\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_6l-e_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_7-e_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_7l-e_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500e_supervisor_engine_8-e_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500e_supervisor_engine_8l-e_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4500e_supervisor_engine_9-e_\(k10\):-:::::::*	not specified by NVD	Running on	Cisco

cpe:2.3:o:cisco:ios:3.6\(2\)e:*:*:*:*:*:*:* Versions 3.6(2)e Vulnerable ·Cisco
cpe:2.3:o:cisco:ios_xe:3.6\(2\)e:*:*:*:*:*:*:* Versions 3.6(2)e Vulnerable ·Cisco
cpe:2.3:h:cisco:catalyst_4500-x_series_switches_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_6-e_\(k5\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_6l-e_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_7-e_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500_supervisor_engine_7l-e_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500e_supervisor_engine_8-e_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500e_supervisor_engine_8l-e_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4500e_supervisor_engine_9-e_\(k10\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco

Show 3 more CPE

CPE	Versions	Role	Vendor
cpe:2.3:h:cisco:catalyst_4900m_switch_\(k5\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:cisco:catalyst_4948e_ethernet_switch_\(k5\):-:::::::*	not specified by NVD	Running on	Cisco
cpe:2.3:h:rockwellautomation:allen-bradley_stratix_8300_industrial_managed_ethernet_switch:-:::::::*	not specified by NVD	Running on	Rockwell

cpe:2.3:h:cisco:catalyst_4900m_switch_\(k5\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:cisco:catalyst_4948e_ethernet_switch_\(k5\):-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
cpe:2.3:h:rockwellautomation:allen-bradley_stratix_8300_industrial_managed_ethernet_switch:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Rockwell

Remediation

No fixed version listed by the sources yet.

Timeline

2022-03-03 Added to CISA KEV
2026-10-02 Threatist record created from CVE-2018-0155
2026-10-03 Alias added: GHSA-qmg7-32mc-92p9

References

Advisory 2

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