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O2 UK before 2025-05-19 allows subscribers to determine the Cell ID of other subscribers by initiating an IMS (IP Multimedia Subsystem) call and then reading the utran-cell-id-3gpp field of a Cellular-Network-Info SIP header, aka an ECI (E-UTRAN Cell Identity) leak. The Cell ID might be usable to identify a cell location via crowdsourced data, and might correspond to a small physical area (e.g., if the called party is in a city centre). Removal of the Cellular-Network-Info header is mentioned in section 4.4.19 of ETSI TS 124 229.
Reserved 2025-05-18 | Published 2025-05-18 | Updated 2025-05-19 | Assigner mitreCWE-201 Insertion of Sensitive Information Into Sent Data
mastdatabase.co.uk/...5/o2-expose-customer-location-call-4g/
news.ycombinator.com/item?id=44014046
www.etsi.org/...299/124229/15.10.00_60/ts_124229v151000p.pdf
www.ispreview.co.uk/...xposed-user-mobile-location-data.html
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