High‑Severity DoS in Cisco IOS XR BGP (CVE‑2010‑3035) Threatens Network Availability
What It Is
A vulnerability in Cisco IOS XR’s implementation of the Border Gateway Protocol (BGP) permits a remote, unauthenticated attacker to trigger a denial‑of‑service condition. By sending crafted BGP packets, the attacker can exhaust processing resources, causing the router to become unresponsive.
Exploitability
The flaw is actively exploitable over the network (TCP 179). Public proof‑of‑concept code has been circulated for years, and the vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog with a High CVSS rating.
Affected Products
- Vendor: Cisco
- Product: IOS XR (any release that includes the vulnerable BGP code path)
Why It Matters for Compliance & Audit Readiness
Network routing is a core control in most frameworks (e.g., NIST CSF ID‑RC‑1, ISO 27001 A.13.1). An unplanned BGP outage can break the continuity of service, leading to evidence gaps in continuous control monitoring and defensible audit trails. Demonstrating that BGP devices are patched, monitored, and that incident response playbooks are exercised satisfies vendor‑management and availability‑control requirements.
Recommended Actions
- Map the control: Align the BGP service to your “Network Availability” control set and record its status in your CMDB.
- Patch promptly: Apply Cisco’s security advisory fix or upgrade to a version where the issue is mitigated.
- Validate posture: Run a targeted vulnerability scan against all IOS XR devices to confirm remediation.
- Monitor for anomalies: Enable BGP session‑flap and CPU‑usage alerts; integrate with a SIEM for real‑time detection.
- Document evidence: Capture patch‑level screenshots, scan reports, and alert‑threshold configurations for audit review.
Source: https://nvd.nist.gov/vuln/detail/CVE-2010-3035