Horizon Alert
Summary of the vulnerability and why it matters
Vulnerabilities within the Link Layer Discovery Protocol (LLDP) subsystem of certain Cisco software versions could allow an attacker with adjacent network access to cause a denial of service or execute arbitrary code. This impacts the availability and integrity of affected devices, potentially leading to a loss of business operations and unauthorized system control. The exposure is limited to adjacent network connections.
- Vulnerable Cisco software components
- Buffer overflow in LLDP subsystem
- Denial of service or code execution
Attack Path
How an attacker could exploit the issue
The Link Layer Discovery Protocol (LLDP) subsystem in affected Cisco software contains buffer overflow vulnerabilities. An attacker on the same local network segment could exploit these vulnerabilities. Successful exploitation could allow the attacker to execute arbitrary code with elevated privileges or cause a denial of service on the targeted device. This could disrupt network operations and potentially compromise sensitive device configurations.
- Exposure condition: Adjacent network access.
- Attacker starting point: Network proximity.
- Trigger and result: Malformed LLDP packet execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability, concerning a buffer overflow in the Link Layer Discovery Protocol (LLDP) subsystem, could allow an attacker to disrupt services or gain elevated privileges. Exploitation requires the attacker to be on the same local network segment as the affected device, limiting the attack surface to adjacent systems. The potential for code execution and denial of service presents a significant risk to affected systems and their operational integrity.
- Attacker skill level: Moderate
- Required access or conditions: Adjacent network access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability affects Cisco IOS, IOS XE, and IOS XR Software. It could permit an attacker on the same network segment to disrupt operations or gain elevated privileges on a device. The vendor has provided updates to address this issue.
- Identify exposed assets.
- Reduce exposure or isolate risk.
- Apply vendor fix and verify.
- Monitor for related issues.
