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Cisco Vulnerability Fix: Deactivate RPM and Block Port 33433 – No Workarounds!
Prevent multicast mayhem on Cisco IOS XR by deactivating the RPM and enforcing iACLs to block UDP port 33433. Restart IGMP and MLD processes to avoid memory leaks. Always test mitigations in your environment to avoid network disruptions.
Hot Take:
Looks like Cisco’s latest security hiccup is more of a “cover your ports” situation than a “patch it up” job. Who knew preventing vulnerabilities could be as simple as turning things off and on again?
Key Points:
- No workarounds available, only mitigations.
- Deactivate multicast RPM to close the vulnerable UDP port.
- Use Infrastructure Access Control Lists (iACLs) to block port 33433.
- Restart IGMP and MLD processes preemptively.
- Evaluate all mitigations carefully to avoid network performance issues.
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