The critical signal in CVE-2026-67305 is not the CVSS 9.4 — it's the EPSS score of 0.00489. This tells you the actual exploitation probability is vanishingly low despite the severity rating. The gap exists because this is a client-side vulnerability requiring an unlikely attack chain: a user must connect to a malicious RDP server AND initiate a clipboard paste operation. That's not a typical network-facing exploit. That's a multi-step, high-friction attack requiring either a compromised server, MITM positioning, or social engineering to get a target to connect to a rogue endpoint.
The vulnerability mechanism matters more than the score. In FreeRDP's clipboard virtual channel, the client initiates a request with a size parameter, allocates a buffer matching that size, then processes the server's response without revalidating that the response actually fits the allocated buffer. The client implicitly trusts server-supplied sizes in a data channel that should be treated as untrusted input regardless of TLS encapsulation. This is a trust boundary inversion — the protocol semantics create a false assumption that the server will honor the client's requested size.
What you should do: prioritize your patch queue differently. This CVE does not warrant emergency patching in most environments. The appropriate response is to include FreeRDP 3.29.0 in your next standard patch cycle, not as a critical-severity escalation. The bandwidth you save should go toward auditing FreeRDP's other virtual channels — RDPSND, DRDYNVC, DISPNO — for the same implicit trust pattern. When one clipboard-adjacent channel exhibits this vulnerability, the same assumption frequently exists in related channels implemented by the same team during the same era. A tooling-assisted audit or fuzzing harness that sends oversized server responses across all channels will likely surface additional instances.
The deployment context matters. If FreeRDP is used in endpoint VPN clients with brief sessions, the attack surface is smaller than in full remote desktop deployments where users maintain persistent connections and perform clipboard operations routinely. Adjust your risk acceptance accordingly. The real vulnerability is not this one CVE — it's the inherited assumption that server responses are inherently bounded, which will produce the next instance in a different channel if only this single patch is applied.