Horizon Alert
Summary of the vulnerability and why it matters
The Simple Network Management Protocol (SNMP) subsystem in Cisco IOS and IOS XE Software contains vulnerabilities. These flaws could allow an attacker to remotely execute code or cause a system reload. Exploitation requires the attacker to send a specially crafted SNMP packet to an affected system.
- Vulnerable component: Cisco IOS and IOS XE Software SNMP subsystem
- Core weakness: Buffer overflow condition
- Main business impact: System compromise or reload
Attack Path
How an attacker could exploit the issue
This vulnerability could allow an attacker to execute code or cause a system reload. The attack involves sending a specially crafted network packet to an affected system. Successful exploitation could grant an attacker control over the system.
- Exposure: Network access to SNMP.
- Attacker starts remotely.
- Trigger: Send crafted SNMP packet; impact is code execution or reload.
Live Threat
Current exploitation, exposure, and threat context
The Simple Network Management Protocol (SNMP) subsystem in Cisco IOS and IOS XE Software is affected by vulnerabilities that could permit an authenticated, remote attacker to execute code or cause system reloads. An attacker could exploit these by sending a specially crafted SNMP packet. Exploitation requires either knowledge of an SNMP read-only community string or user credentials, depending on the SNMP version used.
- Likely attacker skill level: Advanced
- Required access or conditions: Authenticated access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
A critical vulnerability exists in the SNMP subsystem of Cisco IOS and IOS XE Software. This could enable an authenticated, remote attacker to execute code on affected systems or cause them to reload by sending specially crafted SNMP packets. The attacker would need to know SNMP read-only community strings or have user credentials, depending on the SNMP version used. This poses a significant risk to affected organizations, potentially leading to unauthorized control or service disruption.
- Identify all systems with enabled SNMP.
- Restrict SNMP access and MIBs/OIDs.
- Apply vendor fixes and validate.
- Monitor for related network activity.
