{"id":"CVE-2018-0500","aliases":["ALPINE-CVE-2018-0500","BELL-CVE-2018-0500","CURL-CVE-2018-0500","DEBIAN-CVE-2018-0500","EUVD-2018-1322","GHSA-rg4c-f6cj-x9w8","MGASA-2018-0423","SUSE-SU-2018:2423-1","UBUNTU-CVE-2018-0500","USN-3710-1","openSUSE-SU-2024:10582-1"],"status":"published","title":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based...","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-07","score":0.06352,"percentile":0.93683,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2018-07-11T00:00:00Z","modified":"2026-10-25T01:04:53Z","fixes":[{"ecosystem":"Alpine:v3.10","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.5","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.6","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.7","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"curl","fixed_in":["7.61.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"curl","fixed_in":["7.61.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"curl","fixed_in":["7.61.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"curl","fixed_in":["7.61.0-1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux 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Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-0500"},{"url":"https://github.com/advisories/GHSA-rg4c-f6cj-x9w8"},{"url":"https://security.alpinelinux.org/vuln/CVE-2018-0500","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2018-0500","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-0500","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2018-0423.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=22772","tags":["report"]},{"url":"https://curl.haxx.se/docs/adv_2018-9cd6.html","tags":["web"]},{"url":"https://curl.haxx.se/docs/adv_2018-97a2.html","tags":["web"]},{"url":"https://curl.haxx.se/docs/adv_2018-b047.html","tags":["web"]},{"url":"https://curl.haxx.se/docs/adv_2018-82c2.html","tags":["web"]},{"url":"https://curl.haxx.se/docs/adv_2018-b138.html","tags":["web"]},{"url":"https://curl.haxx.se/docs/CVE-2018-14618.html","tags":["advisory"]},{"url":"https://usn.ubuntu.com/3598-1/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/DOHQJ7DDUE5U4L6FHSUVPFQ7TAZLWSMI/","tags":["web"]},{"url":"https://www.debian.org/security/2018/dsa-4286","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2018/suse-su-20182423-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1099793","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2018-0500","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2018-0500","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3710-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-0500","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2006-1061","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9586","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9594","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000099","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000100","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000101","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000254","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-1000257","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-2629","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-7468","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8816","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8817","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8818","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9502","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000005","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000120","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000122","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000300","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-1000301","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-14618","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16839","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16840","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16842","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16890","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15601","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3822","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3823","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5435","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5436","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5481","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-5482","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8169","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8231","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8284","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8285","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8286","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22297","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22298","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22876","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22890","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22898","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22901","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22922","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22924","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22945","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22946","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-22947","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-0500","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T13:00:00Z","modified":"2024-08-05T03:28:11.048Z","updated_at":"2026-11-02T14:35:12.596526Z"}],"euvd":[{"id":"EUVD-2018-1322","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T13:00:00Z","modified":"2024-08-05T03:28:11Z","updated_at":"2026-11-03T02:40:18.31448Z"}],"ghsa":[{"id":"GHSA-rg4c-f6cj-x9w8","title":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based...","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2022-05-13T01:18:24Z","modified":"2023-02-01T05:05:25Z","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-787"],"updated_at":"2026-11-02T14:50:14.84305Z"}],"nvd":[{"id":"CVE-2018-0500","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T13:29:00.317Z","modified":"2026-06-17T01:31:00.037Z","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","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-787"],"updated_at":"2026-11-02T14:04:32.929986Z"}],"osv":[{"id":"ALPINE-CVE-2018-0500","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T13:29:00.317Z","modified":"2026-10-23T17:17:55.144794695Z","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-2018-0500","title":"CVE-2018-0500 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:14:43.274485Z","modified":"2026-01-26T09:47:52.577531Z","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-2018-0500","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T13:29:00.317Z","modified":"2026-10-20T13:30:37.39309688Z","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":"2026-11-02T15:44:07.192756Z"},{"id":"DEBIAN-CVE-2018-0500","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T13:29:00.317Z","modified":"2026-10-23T18:03:17.41043465Z","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":"2026-11-02T15:45:29.988046Z"},{"id":"UBUNTU-CVE-2018-0500","description":"Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).","status":"published","published":"2018-07-11T00:00:00Z","modified":"2026-04-22T11:39:10.608129Z","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":"2026-11-02T15:54:16.154988Z"},{"id":"CURL-CVE-2018-0500","title":"SMTP send heap buffer overflow","description":"curl might overflow a heap based memory buffer when sending data over SMTP and\nusing a reduced read buffer.\n\nWhen sending data over SMTP, curl allocates a separate \"scratch area\" on the\nheap to be able to escape the uploaded data properly if the uploaded data\ncontains data that requires it.\n\nThe size of this temporary scratch area was mistakenly made to be `2 *\nsizeof(download_buffer)` when it should have been made `2 *\nsizeof(upload_buffer)`.\n\nThe upload and the download buffer sizes are identically sized by default\n(16KB) but since version 7.54.1, curl can resize the download buffer into a\nsmaller buffer (as well as larger). If the download buffer size is set to a\nvalue smaller than 10923, the `Curl_smtp_escape_eob()` function might overflow\nthe scratch buffer when sending contents of sufficient size and contents.\n\nThe curl command line tool lowers the buffer size when `--limit-rate` is set\nto a value smaller than 16KB.","status":"published","published":"2018-07-11T08:00:00Z","modified":"2026-10-25T01:04:53.218564481Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"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-2018:2423-1","title":"Security update for curl","description":"This update for curl fixes the following issues:\n\nSecurity issue fixed:\n\n- CVE-2018-0500: Fix a SMTP send heap buffer overflow (bsc#1099793).\n","status":"published","published":"2018-08-17T16:21:00Z","modified":"2026-02-04T03:22:09.556999Z","updated_at":"2026-11-02T15:53:45.378228Z"},{"id":"USN-3710-1","title":"curl vulnerability","description":"Peter Wu discovered that curl incorrectly handled certain SMTP buffers. A\nremote attacker could use this issue to cause curl to crash, resulting in a\ndenial of service, or possibly execute arbitrary code.\n","status":"published","published":"2018-07-11T12:14:14Z","modified":"2026-04-22T09:47:59.419554Z","updated_at":"2026-11-02T16:58:13.496563Z"}]}}