Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists in the Internet Key Exchange Version 1 (IKEv1) functionality of Cisco IOS and IOS XE Software. This flaw could enable an unauthenticated, remote attacker to disrupt operations by causing an affected device to reload, leading to a denial of service. The issue stems from the software's improper validation of specific IKEv1 packets sent during the negotiation process.
- Cisco IOS and IOS XE Software
- Improper IKEv1 packet validation
- Service disruption and device reloads
Attack Path
How an attacker could exploit the issue
An attacker can exploit a vulnerability in Cisco's Internet Key Exchange Version 1 (IKEv1) functionality. This could allow an unauthenticated, remote attacker to cause a denial-of-service condition by sending crafted IKEv1 packets during an IKE negotiation. The successful exploitation would result in an affected device reloading, disrupting operations.
- Exposed IKEv1 functionality
- Attacker sends crafted IKEv1 packets
- Device reloads, causing denial of service
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows an unauthenticated, remote attacker to cause a denial-of-service condition by reloading an affected device. The attacker can exploit this by sending crafted Internet Key Exchange Version 1 (IKEv1) packets during an IKE negotiation. This could disrupt network services.
- Attacker skill level: Low
- Required access or conditions: Network access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability impacts organizations utilizing Cisco IOS and IOS XE Software by exposing them to denial-of-service risks. Attackers can exploit this by sending specially crafted Internet Key Exchange Version 1 (IKEv1) packets, potentially causing affected devices to reload and disrupt network services. The risk is heightened as this vulnerability affects public-facing services like VPNs and IPsec gateways, which are accessible from the internet.
- Find affected Cisco devices.
- Isolate network exposure.
- Apply vendor updates and verify.
- Monitor for related activity.
