Horizon Alert
Summary of the vulnerability and why it matters
The Link Layer Discovery Protocol (LLDP) subsystem in Cisco software is affected by a format string vulnerability. This flaw could permit an attacker with adjacent network access to disrupt services or gain elevated privileges on an affected device. The potential impact includes denial of service and unauthorized code execution.
- Vulnerable Cisco LLDP subsystem
- Improper handling of format strings
- Denial of service, code execution
Attack Path
How an attacker could exploit the issue
A format string vulnerability within the Link Layer Discovery Protocol (LLDP) subsystem of Cisco devices could allow an adjacent attacker to gain elevated privileges or cause a denial of service. This exploit targets the LLDP subsystem, a component responsible for network device discovery. The vulnerability allows an unauthenticated attacker on the same network segment to potentially execute arbitrary code or disrupt service on the affected device.
- Adjacent network exposure
- Unauthenticated attacker access
- Triggering LLDP to gain control
Live Threat
Current exploitation, exposure, and threat context
A format string vulnerability in Cisco's Link Layer Discovery Protocol (LLDP) subsystem could allow an attacker to disrupt service or execute code on affected devices. This impacts organizations using Cisco IOS, IOS XE, or IOS XR software. The vulnerability is classified as high severity, indicating a significant potential for business risk.
- Likely attacker skill level: Low
- Required access or conditions: Adjacent network access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
An adjacent attacker could exploit a format string vulnerability in Cisco's Link Layer Discovery Protocol (LLDP) subsystem. This could lead to a denial-of-service condition or unauthorized code execution with elevated privileges on affected devices. The vulnerability impacts Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software.
- Identify affected Cisco devices.
- Reduce exposure or isolate risk.
- Apply vendor fixes and validate.
- Monitor for related security issues.
