CVE-2006-0340: Unspecified vulnerability in Stack Group Bidding Protocol (SGBP) support in Cisco IOS 12.0 through 12.4 run...

Security readout for executives and security teams

This flaw can let someone already on the local network crash or hang affected Cisco IOS devices if SGBP is enabled. The business impact is availability: network traffic may be lost until the device recovers or is restored. The source bundle does not provide a CVSS score or confirmed exploitation evidence. Exposure is most likely in legacy Cisco IOS environments still running 12.0 through 12.4 with SGBP enabled and reachable from local network segments. Internet exposure is not supported by the provided sources; the described attacker position is local network access. Treat this as a targeted availability risk for legacy network infrastructure. It is not KEV-listed, but affected routers or switches in critical paths could cause business disruption if reachable by an internal attacker or compromised local host. Mitigation focus: Check Cisco’s advisory for affected platforms and fixed IOS guidance.; Disable SGBP where it is not operationally required.; Limit UDP port 9900 reachability to trusted local management or peer segments..

Prepared

Jun 29, 2026, 15:05 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.