{"id":"CVE-2026-55005","aliases":["EUVD-2026-44024","GHSA-6m3r-w7v9-p35g"],"status":"published","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.0101,"percentile":0.63368,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-07-14T17:04:57Z","modified":"2026-11-01T17:32:38Z","products":[{"vendor":"microsoft","product":"exchange_server"},{"vendor":"microsoft","product":"exchange_server_subscription_edition"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 23"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 14"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 15"},{"vendor":"microsoft","product":"microsoft exchange server subscription edition rtm"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55005"},{"url":"https://github.com/advisories/GHSA-6m3r-w7v9-p35g"}],"sources":{"cve":[{"id":"CVE-2026-55005","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:04:57.884Z","modified":"2026-11-01T17:32:38.775Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-44024","description":"Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:04:57Z","modified":"2026-11-01T17:32:38Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T16:58:49.161713Z"}],"ghsa":[{"id":"GHSA-6m3r-w7v9-p35g","title":"Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute...","description":"Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-14T18:32:09Z","modified":"2026-07-14T18:32:17Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:09:28.885137Z"}],"nvd":[{"id":"CVE-2026-55005","description":"Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.","status":"published","published":"2026-07-14T17:17:08.537Z","modified":"2026-10-14T22:10:00.21Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}