{"id":"CVE-2023-26433","aliases":["EUVD-2023-30253","GHSA-f8cc-v72f-5rm2"],"status":"published","title":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited...","description":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01148,"percentile":0.67077,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2023-06-20T07:51:50Z","modified":"2026-06-17T05:43:19Z","products":[{"vendor":"open-xchange","product":"open-xchange_appsuite_backend"},{"vendor":"open-xchange gmbh","product":"ox app suite"},{"vendor":"ox software gmbh","product":"ox app suite"}],"references":[{"url":"https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf","tags":["release-notes","x_transferred","Release Notes"]},{"url":"https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json","tags":["vendor-advisory","x_transferred"]},{"url":"http://seclists.org/fulldisclosure/2023/Jun/8","tags":["x_transferred","Mailing List","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html","tags":["x_transferred","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-26433"},{"url":"https://documentation.open-xchange.com/security/advisories/csaf/oxas-adv-2023-0002.json"},{"url":"https://github.com/advisories/GHSA-f8cc-v72f-5rm2"}],"sources":{"cve":[{"id":"CVE-2023-26433","description":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.\n\n","status":"published","published":"2023-06-20T07:51:50.177Z","modified":"2024-08-02T11:46:24.671Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:35:15.434947Z"}],"euvd":[{"id":"EUVD-2023-30253","description":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.\n\n","status":"published","published":"2023-06-20T07:51:50Z","modified":"2024-08-02T11:46:24Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T03:50:06.766939Z"}],"ghsa":[{"id":"GHSA-f8cc-v72f-5rm2","title":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited...","description":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.\n\n","status":"published","published":"2023-06-20T09:30:23Z","modified":"2024-01-12T09:30:27Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:55:24.514817Z"}],"nvd":[{"id":"CVE-2023-26433","description":"When adding an external mail account, processing of IMAP \"capabilities\" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.\n\n","status":"published","published":"2023-06-20T08:15:09.427Z","modified":"2026-06-17T05:43:19.463Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:08:12.414559Z"}]}}