{"id":"CVE-2017-17671","aliases":["EUVD-2017-8828","GHSA-6378-4h5g-h5vx"],"status":"published","title":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call...","description":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of \"..\" to reach an Apache HTTP Server log file.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.0305,"percentile":0.87638,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-22"],"published":"2017-12-14T00:00:00Z","modified":"2026-06-17T01:11:28Z","products":[{"vendor":"vbulletin","product":"vbulletin"}],"references":[{"url":"https://blogs.securiteam.com/index.php/archives/3569","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-17671"},{"url":"https://github.com/advisories/GHSA-6378-4h5g-h5vx"}],"sources":{"cve":[{"id":"CVE-2017-17671","description":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of \"..\" to reach an Apache HTTP Server log file.","status":"published","published":"2017-12-14T00:00:00Z","modified":"2024-08-05T20:59:17.456Z","updated_at":"2026-11-02T14:33:18.248329Z"}],"euvd":[{"id":"EUVD-2017-8828","description":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of \"..\" to reach an Apache HTTP Server log file.","status":"published","published":"2017-12-14T00:00:00Z","modified":"2024-08-05T20:59:17Z","updated_at":"2026-11-03T02:23:08.959608Z"}],"ghsa":[{"id":"GHSA-6378-4h5g-h5vx","title":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call...","description":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of \"..\" to reach an Apache HTTP Server log file.","status":"published","published":"2022-05-13T01:23:21Z","modified":"2023-02-01T05:07:21Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:50:31.687075Z"}],"nvd":[{"id":"CVE-2017-17671","description":"vBulletin through 5.3.x on Windows allows remote PHP code execution because a require_once call is reachable with an unauthenticated request that can include directory traversal sequences to specify an arbitrary pathname, and because ../ traversal is blocked but ..\\ traversal is not blocked. For example, an attacker can make an invalid HTTP request containing PHP code, and then make an index.php?routestring= request with enough instances of \"..\" to reach an Apache HTTP Server log file.","status":"published","published":"2017-12-14T00:29:00.217Z","modified":"2026-06-17T01:11:28.36Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:04:10.156892Z"}]}}