Security readout for executives and security teams
This is a denial-of-service issue in Nortel UNIStim voice products. An attacker can make affected phones or clients hang by flooding them with Mute and UnMute signaling messages that appear to come from the Signaling Server. Business impact is loss or disruption of affected voice endpoints, not data theft based on the provided sources. Exposure is most likely in legacy Nortel/UNIStim voice deployments, especially where endpoint signaling traffic is reachable from untrusted or poorly segmented networks. Internet exposure is not established by the sources. Treat this as a continuity risk for legacy voice infrastructure. Prioritize if Nortel UNIStim systems support emergency, call-center, operations, or executive communications. Lower urgency if these products are retired or isolated. Mitigation focus: Check the Nortel support advisory for vendor-approved fixes or configuration guidance.; Inventory Nortel UNIStim phones, softphones, mobile clients, and WLAN handsets still in use.; Restrict voice signaling traffic to trusted voice network segments where feasible..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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CVE-2007-5639 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- nortel-ipphone-spoof-dos(37253)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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