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CVE-2018-0155

HIGH
8.6
CVSS Score
Published: March 28, 2018 at 10:00 PM UTC
Updated: June 17, 2026 at 01:29 AM UTC
12 products affected across 1 vendorIOSIOS XeCatalyst 4900M Switch (K5)· also runs on 1 platform

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Severity
HIGH8.6
Exploitation
CISA KEV
Exploit prediction
EPSS 8%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score7.7%

EPSS (Exploit Prediction Scoring System) estimates a 7.7% chance this CVE is exploited in the wild within the next 30 days — higher than 95% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Mar 3, 2022
Remediation Due
Mar 17, 2022
1685 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2018-0155

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS· Cisconpm
95%
3.6(2)e
cisco-catalyst-4500-supervisor-engine-6-e-k5 (environment) · cisco-catalyst-4500-supervisor-engine-6l-e-k10 (environment) · cisco-catalyst-4500-supervisor-engine-7-e-k10 (environment) · cisco-catalyst-4500-supervisor-engine-7l-e-k10 (environment) · cisco-catalyst-4500-x-series-switches-k10 (environment) · cisco-catalyst-4500e-supervisor-engine-8-e-k10 (environment) · cisco-catalyst-4500e-supervisor-engine-8l-e-k10 (environment) · cisco-catalyst-4500e-supervisor-engine-9-e-k10 (environment) · cisco-catalyst-4900m-switch-k5 (environment) · cisco-catalyst-4948e-ethernet-switch-k5 (environment) · rockwellautomation-allen-bradley-stratix-8300-industrial-managed-ethernet-switch (environment)
IOS Xe· Cisco
95%
3.6(2)e
cisco-catalyst-4500-supervisor-engine-6-e-k5 (environment) · cisco-catalyst-4500-supervisor-engine-6l-e-k10 (environment) · cisco-catalyst-4500-supervisor-engine-7-e-k10 (environment) · cisco-catalyst-4500-supervisor-engine-7l-e-k10 (environment) · cisco-catalyst-4500-x-series-switches-k10 (environment) · cisco-catalyst-4500e-supervisor-engine-8-e-k10 (environment) · cisco-catalyst-4500e-supervisor-engine-8l-e-k10 (environment) · cisco-catalyst-4500e-supervisor-engine-9-e-k10 (environment) · cisco-catalyst-4900m-switch-k5 (environment) · cisco-catalyst-4948e-ethernet-switch-k5 (environment) · rockwellautomation-allen-bradley-stratix-8300-industrial-managed-ethernet-switch (environment)
Catalyst 4500 Supervisor Engine 6-E (K5)· Ciscodevice
80%
All versions
Catalyst 4500 Supervisor Engine 6L-E (K10)· Ciscodevice
80%
All versions
Catalyst 4500 Supervisor Engine 7-E (K10)· Ciscodevice
80%
All versions
Catalyst 4500 Supervisor Engine 7L-E (K10)· Ciscodevice
80%
All versions
Catalyst 4500-X Series Switches (K10)· Ciscodevice
80%
All versions
Catalyst 4500E Supervisor Engine 8-E (K10)· Ciscodevice
80%
All versions
Catalyst 4500E Supervisor Engine 8L-E (K10)· Ciscodevice
80%
All versions
Catalyst 4500E Supervisor Engine 9-E (K10)· Ciscodevice
80%
All versions

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

VDB Entryx_refsource_BIDThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/103565
VDB Entryx_refsource_SECTRACKThird Party Advisory
Source: [email protected]
http://www.securitytracker.com/id/1040587
x_refsource_MISCThird Party AdvisoryUS Government Resource
Source: [email protected]
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0155

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-388CWE-755

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