Horizon Alert
Summary of the vulnerability and why it matters
Cisco IOS XR software contains a vulnerability that can be triggered by specially crafted BGP UPDATE messages. This flaw could allow an attacker to reset network sessions, potentially disrupting established communication channels. The impact can range from temporary interruptions to more significant service degradations for organizations relying on these network devices for connectivity.
- Vulnerable Cisco IOS XR software
- Invalid BGP message causes session reset
- Network disruption and service interruption
Attack Path
How an attacker could exploit the issue
This vulnerability allows for a denial-of-service impact on affected Cisco IOS XR devices. Attackers can exploit this by sending specifically crafted network traffic that triggers a session reset. The ability to cause a denial of service poses a risk to network availability and the continuous operation of business processes that rely on the affected systems.
- Exposure condition: Network access is available.
- Attacker starting point: Unauthenticated network attacker.
- Trigger and result: Invalid BGP message causes session reset.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Cisco IOS XR allows remote attackers to cause a denial of service by sending a malformed BGP UPDATE message. Such an attack could disrupt network routing, impacting the availability of services that rely on the affected network infrastructure. The exploit has been observed in the wild, indicating a real-world threat.
- Likely attacker skill level: Moderate.
- Required access or conditions: Network access.
- Business risk or urgency: High.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability may impact organizations using Cisco IOS XR software, potentially leading to a denial of service through session resets. Attackers could exploit this by sending a malformed BGP UPDATE message. The primary business risk involves disruption of network connectivity and services dependent on BGP routing.
- Identify Cisco IOS XR assets.
- Restrict BGP network exposure.
- Apply vendor updates and verify.
- Monitor network traffic for anomalies.
