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CVE-2018-0155 — A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of…

Key facts

CVE-2018-0155 is a High (8.6) vulnerability: A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-03-03), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2018-0155 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-03-03), confirming exploitation in the wild. Federal remediation deadline: 2022-03-17. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2018-0155
Severity High (8.6)
CISA KEV Actively exploited (added 2022-03-03)
Detection / prevention —
PoC poc.py
Source 2018/CVE-2018-0155/

Details

English | 한국어

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.

Vulnerability Details

Property Value
CVE ID CVE-2018-0155
CVSS Score 8.6

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2018/CVE-2018-0155/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2018-0155

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • http://www.securityfocus.com/bid/103565
  • http://www.securitytracker.com/id/1040587
  • https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
  • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd
  • http://www.securityfocus.com/bid/103565
  • http://www.securitytracker.com/id/1040587
  • https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
  • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0155

Generated by PoC Generator on 2026-07-12T03:36:39.546942766

Frequently asked questions

What is CVE-2018-0155?

CVE-2018-0155 is a High (8.6) vulnerability: A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-03-03), confirming active exploitation in the wild.

How do I detect CVE-2018-0155?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2018-0155?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2018-0155 actively exploited?

Yes. CVE-2018-0155 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-03-03, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2022-03-17. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.