{"id":"CVE-2025-48219","aliases":["EUVD-2025-15631","GHSA-7rcm-4jcj-r4q6"],"status":"published","title":"O2 UK through 2025-05-17 allows subscribers to determine the Cell ID of other subscribers by...","description":"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.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00339,"percentile":0.27677,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-201"],"published":"2025-05-18T00:00:00Z","modified":"2026-06-17T09:29:18Z","products":[{"vendor":"o2 uk","product":"o2"}],"references":[{"url":"https://mastdatabase.co.uk/blog/2025/05/o2-expose-customer-location-call-4g/"},{"url":"https://news.ycombinator.com/item?id=44014046"},{"url":"https://www.etsi.org/deliver/etsi_ts/124200_124299/124229/15.10.00_60/ts_124229v151000p.pdf"},{"url":"https://www.ispreview.co.uk/index.php/2025/05/o2-uk-fixes-volte-flaw-that-exposed-user-mobile-location-data.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48219"},{"url":"https://mastdatabase.co.uk/blog/2025/05/o2-expose-customer-location-call-4g"},{"url":"https://github.com/advisories/GHSA-7rcm-4jcj-r4q6"}],"sources":{"cve":[{"id":"CVE-2025-48219","description":"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.","status":"published","published":"2025-05-18T00:00:00Z","modified":"2025-05-19T20:06:21.326Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-201"],"updated_at":"2026-11-02T14:32:41.41198Z"}],"euvd":[{"id":"EUVD-2025-15631","description":"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.","status":"published","published":"2025-05-18T00:00:00Z","modified":"2025-05-19T20:06:21Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T20:32:43.763029Z"}],"ghsa":[{"id":"GHSA-7rcm-4jcj-r4q6","title":"O2 UK through 2025-05-17 allows subscribers to determine the Cell ID of other subscribers by...","description":"O2 UK through 2025-05-17 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.","status":"published","published":"2025-05-18T15:30:20Z","modified":"2025-05-19T15:30:52Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-201"],"updated_at":"2026-11-02T15:02:20.924524Z"}],"nvd":[{"id":"CVE-2025-48219","description":"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.","status":"published","published":"2025-05-18T15:15:17.34Z","modified":"2026-06-17T09:29:18.527Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-201"],"updated_at":"2026-11-02T14:11:08.321805Z"}]}}