{"id":"CVE-2018-14618","aliases":["ALPINE-CVE-2018-14618","BELL-CVE-2018-14618","CURL-CVE-2018-14618","DEBIAN-CVE-2018-14618","DLA-1498-1","DSA-4286-1","EUVD-2018-6525","GHSA-4mp9-8964-jxmg","MGASA-2018-0423","RHSA-2018:3558","RHSA-2019:1880","SUSE-SU-2018:2629-1","SUSE-SU-2018:2714-1","SUSE-SU-2018:2715-1","SUSE-SU-2018:2717-1","UBUNTU-CVE-2018-14618","USN-3765-1","openSUSE-SU-2024:10582-1"],"status":"published","title":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The...","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","severity":{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.11115,"percentile":0.95964,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-122","CWE-131","CWE-190"],"published":"2018-09-05T00:00:00Z","modified":"2026-10-25T01:05:30Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.5","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.6","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.7","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"curl","fixed_in":["7.61.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"curl","fixed_in":["7.62.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"curl","fixed_in":["7.62.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"curl","fixed_in":["7.62.0-1"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"curl","fixed_in":["7.38.0-4+deb8u12"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"curl","fixed_in":["7.52.1-5+deb9u7"],"sources":["osv"]},{"ecosystem":"Red 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before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T19:00:00Z","modified":"2026-04-15T20:54:19.698Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-131","CWE-122"],"updated_at":"2026-11-02T14:35:00.589142Z"}],"euvd":[{"id":"EUVD-2018-6525","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T19:00:00Z","modified":"2026-04-15T20:54:19Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T19:24:24.796113Z"}],"ghsa":[{"id":"GHSA-4mp9-8964-jxmg","title":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The...","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2022-05-14T01:09:09Z","modified":"2023-02-02T05:03:19Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:51:37.12522Z"}],"nvd":[{"id":"CVE-2018-14618","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T19:29:00.42Z","modified":"2026-06-17T01:41:18.1Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-122","CWE-131","CWE-190"],"updated_at":"2026-11-02T14:04:38.672108Z"}],"osv":[{"id":"ALPINE-CVE-2018-14618","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T19:29:00.42Z","modified":"2026-10-23T17:17:55.216252286Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:27:47.187336Z"},{"id":"BELL-CVE-2018-14618","title":"CVE-2018-14618 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:15:56.696893Z","modified":"2026-01-26T09:47:35.791007Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2018-14618","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T19:29:00.42Z","modified":"2026-10-24T10:30:48.631256866Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:44:08.242347Z"},{"id":"DEBIAN-CVE-2018-14618","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T19:29:00.42Z","modified":"2026-10-23T18:02:59.684562223Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:45:30.290351Z"},{"id":"RHSA-2018:3558","title":"Red Hat Security Advisory: httpd24 security, bug fix, and enhancement update","status":"published","published":"2024-09-13T16:54:33Z","modified":"2026-09-21T10:02:03Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:05.383061Z"},{"id":"RHSA-2019:1880","title":"Red Hat Security Advisory: curl security and bug fix update","status":"published","published":"2024-09-13T16:57:02Z","modified":"2026-08-05T10:06:14Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:06.0195Z"},{"id":"UBUNTU-CVE-2018-14618","description":"curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t, the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one, making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)","status":"published","published":"2018-09-05T00:00:00Z","modified":"2026-04-22T11:41:42.939543Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:17.014176Z"},{"id":"CURL-CVE-2018-14618","title":"NTLM password overflow via integer overflow","description":"libcurl contains a buffer overrun in the NTLM authentication code.\n\nThe internal function `Curl_ntlm_core_mk_nt_hash` multiplies the `length` of\nthe password by two (SUM) to figure out how large temporary storage area to\nallocate from the heap.\n\nThe `length` value is then subsequently used to iterate over the password and\ngenerate output into the allocated storage buffer. On systems with a 32-bit\n`size_t`, the math to calculate SUM triggers an integer overflow when the\npassword length exceeds 2GB (2^31 bytes). This integer overflow usually causes\na tiny buffer to actually get allocated instead of the intended huge one,\nmaking the use of that buffer end up in a heap buffer overflow.\n\n(This bug is almost identical to\n[CVE-2017-8816](https://curl.se/docs/CVE-2017-8816.html).)","status":"published","published":"2018-09-05T08:00:00Z","modified":"2026-10-25T01:05:30.94577539Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"id":"DLA-1498-1","title":"curl - security update","status":"published","published":"2018-09-08T00:00:00Z","modified":"2026-03-09T01:01:50.749196Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DSA-4286-1","title":"curl - security update","status":"published","published":"2018-09-05T00:00:00Z","modified":"2026-03-09T02:11:38.71179Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"MGASA-2018-0423","title":"Updated curl packages fix security vulnerabilities","description":"Updated curl packages fix security vulnerabilities:\n\nPeter Wu discovered that curl incorrectly handled certain SMTP buffers. A\nremote attacker could use this issue to cause curl to crash, resulting in\na denial of service, or possibly execute arbitrary code (CVE-2018-0500).\n\nZhaoyang Wu discovered that cURL, an URL transfer library, contains a buffer\noverflow in the NTLM authentication code triggered by passwords that exceed\n2GB in length on 32bit systems (CVE-2018-14618).\n\nPhan Thanh discovered that curl incorrectly handled certain FTP paths.\nAn attacker could use this to cause a denial of service or possibly\nexecute arbitrary code (CVE-2018-1000120).\n\nDario Weisser discovered that curl incorrectly handled certain LDAP URLs.\nAn attacker could possibly use this issue to cause a denial of service\n(CVE-2018-1000121).\n\nMax Dymond discovered that curl incorrectly handled certain RTSP data. An\nattacker could possibly use this to cause a denial of service or even to\nget access to sensitive data (CVE-2018-1000122).\n\nA heap-based buffer overflow can happen when closing down an FTP connection\nwith very long server command replies. When doing FTP transfers, curl keeps\na spare \"closure handle\" around internally that will be used when an FTP\nconnection gets shut down since the original curl easy handle is then\nalready removed. FTP server response data that gets cached from the original\ntransfer might then be larger than the default buffer size (16 KB) allocated\nin the \"closure handle\", which can lead to a buffer overwrite. The contents\nand size of that overwrite is controllable by the server (CVE-2018-1000300).\n\ncurl can be tricked into reading data beyond the end of a heap based buffer\nused to store downloaded content. When servers send RTSP responses back to\ncurl, the data starts out with a set of headers. curl parses that data to\nseparate it into a number of headers to deal with those appropriately and to\nfind the end of the headers that signal the start of the \"body\" part. The\nfunction that splits up the response into headers is called\n\"Curl_http_readwrite_headers()\" and in situations where it can't find a\nsingle header in the buffer, it might end up leaving a pointer pointing\ninto the buffer instead of to the start of the buffer which then later on\nmay lead to an out of buffer read when code assumes that pointer points to\na full buffer size worth of memory to use. This could potentially lead to\ninformation leakage but most likely a crash/denial of service for\napplications if a server triggers this flaw (CVE-2018-1000301).\n","status":"published","published":"2018-10-30T18:01:43Z","modified":"2026-04-16T06:23:07.715763588Z","updated_at":"2026-11-02T15:49:40.793816Z"},{"id":"openSUSE-SU-2024:10582-1","title":"curl-7.79.1-1.1 on GA media","description":"These are all security issues fixed in the curl-7.79.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:40:36.472951Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2018:2629-1","title":"Security update for curl","description":"This update for curl fixes the following security issues:\n\n- CVE-2018-1000120: Prevent buffer overflow in the FTP URL handling that\n  allowed an attacker to cause a denial of service (bsc#1084521).\n- CVE-2018-14618: Prevent integer overflow in the NTLM authentication code\n  (bsc#1106019)\n","status":"published","published":"2018-09-05T14:55:50Z","modified":"2026-02-04T03:55:19.916142Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"SUSE-SU-2018:2714-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nThis security issue was fixed:\n\n- CVE-2018-14618: Prevent integer overflow in the NTLM authentication code\n  (bsc#1106019)\n\nThis non-security issue was fixed:\n\n- Use OPENSSL_config instead of CONF_modules_load_file() to avoid crashes due\n  to openssl engines conflicts (bsc#1086367)\n","status":"published","published":"2018-09-14T10:46:42Z","modified":"2026-02-04T02:30:30.797969Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"SUSE-SU-2018:2715-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nThis security issue was fixed:\n\n- CVE-2018-14618: Prevent integer overflow in the NTLM authentication code (bsc#1106019)\n\nThis non-security issue was fixed:\n\n- Fixed erroneous debug message when paired with OpenSSL (bsc#1089533)\n","status":"published","published":"2018-09-14T10:46:29Z","modified":"2026-02-04T03:01:52.711007Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"SUSE-SU-2018:2717-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\n- CVE-2018-14618: Prevent integer overflow in the NTLM authentication code\n  (bsc#1106019).\n","status":"published","published":"2018-09-14T10:46:05Z","modified":"2025-05-02T04:07:47.531467Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"USN-3765-1","title":"curl vulnerability","description":"It was discovered that curl incorrectly handled certain inputs.\nAn attacker could possibly use this to execute arbitrary code.\n","status":"published","published":"2018-09-17T07:30:55Z","modified":"2026-04-22T09:48:48.738391Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}