{"id":"CVE-2018-1000027","aliases":["ALPINE-CVE-2018-1000027","CLSA-2026-1776878817","CLSA-2026-1776879277","CLSA-2026-1777539404","CLSA-2026-1777541147","DEBIAN-CVE-2018-1000027","DLA-1266-1","DLA-1267-1","DSA-4122-1","EUVD-2018-1788","GHSA-hwhj-rr4w-2xmm","RHSA-2020:1068","SUSE-SU-2018:0636-1","SUSE-SU-2018:0752-1","UBUNTU-CVE-2018-1000027","USN-3557-1","openSUSE-SU-2024:11403-1"],"status":"published","title":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a...","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and 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8-1172","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19131","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19132","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12519","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12523","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12525","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12526","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12527","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12528","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12529","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-12854","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-13345","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-18677","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-18678","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-18679","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-18860","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11945","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-14059","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15049","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15810","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15811","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-24606","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25097","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8449","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8517","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-28651","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-28652","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-28662","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-31806","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-1000027","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-02-09T23:00:00Z","modified":"2024-08-05T12:33:49.031Z","updated_at":"2026-11-02T14:35:10.685174Z"}],"euvd":[{"id":"EUVD-2018-1788","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-02-09T23:00:00Z","modified":"2024-08-05T12:33:49Z","updated_at":"2026-11-03T02:39:26.824954Z"}],"ghsa":[{"id":"GHSA-hwhj-rr4w-2xmm","title":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a...","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2022-05-14T00:56:21Z","modified":"2023-02-02T05:02:51Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:51:31.346473Z"}],"nvd":[{"id":"CVE-2018-1000027","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-02-09T23:29:00.87Z","modified":"2026-06-17T01:32:14.273Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:04:22.897995Z"}],"osv":[{"id":"ALPINE-CVE-2018-1000027","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-02-09T23:29:00.87Z","modified":"2026-10-23T17:17:55.148447812Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:47.187336Z"},{"id":"CVE-2018-1000027","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-02-09T23:29:00.87Z","modified":"2026-10-20T10:50:12.944809679Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:07.192756Z"},{"id":"DEBIAN-CVE-2018-1000027","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-02-09T23:29:00.87Z","modified":"2026-10-23T18:03:17.220418658Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:29.988046Z"},{"id":"RHSA-2020:1068","title":"Red Hat Security Advisory: squid security and bug fix update","status":"published","published":"2024-09-16T02:49:37Z","modified":"2026-06-26T10:46:56Z","cvss":[{"version":"3.0","score":7.4,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:06.535721Z"},{"id":"UBUNTU-CVE-2018-1000027","description":"The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.","status":"published","published":"2018-01-29T00:00:00Z","modified":"2026-02-04T04:19:52.511568Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:16.154988Z"},{"id":"CLSA-2026-1776878817","title":"squid: Fix of 13 CVEs","description":"- CVE-2018-1000027: fix NULL pointer dereference in\n  clientFollowXForwardedForCheck for transactions without a client connection\n- CVE-2018-19131: fix XSS via X.509 certificate fields rendered unescaped in\n  SSL error pages\n- CVE-2019-12520: prevent cache poisoning by suppressing URL userinfo from\n  absolute URLs for non-FTP schemes\n- CVE-2019-12523: reject URIs with invalid scheme (non-alpha first char) and\n  malformed URN NID\n- CVE-2019-12526: add Must() guard in URN response handling to prevent\n  re-entry with zero-length buffer\n- CVE-2019-12528: fix FTP directory listing parser info leak from heap into\n  HTTP responses\n- CVE-2019-12529: fix Basic auth uudecode out-of-bounds read/write via proper\n  bounds checking\n- CVE-2019-13345: fix multiple XSS issues in cachemgr.cgi via rfc1738-escaping\n  user_name and auth parameters\n- CVE-2019-18676: cap URI scheme length and reject malformed scheme prefixes\n  to prevent buffer overflow in urlParse\n- CVE-2019-18677: prevent CSRF via append_domain truncation by rejecting\n  oversized domain appends\n- CVE-2019-18678: reject HTTP headers with whitespace between field-name and\n  colon per RFC 7230 to prevent request splitting\n- CVE-2019-18679: remove raw heap pointer from Digest nonce hash input to\n  prevent information disclosure and ASLR bypass\n- CVE-2019-18860: fix cachemgr.cgi XSS/info-disclosure via hostname parameter\n  validation","status":"published","published":"2026-10-21T13:51:54Z","modified":"2026-10-26T09:31:38.642283922Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1776879277","title":"squid: Fix of 13 CVEs","description":"- CVE-2018-1000027: fix NULL pointer dereference in\n  clientFollowXForwardedForCheck for transactions without a client connection\n- CVE-2018-19131: fix XSS via X.509 certificate fields rendered unescaped in\n  SSL error pages\n- CVE-2019-12520: prevent cache poisoning by suppressing URL userinfo from\n  absolute URLs for non-FTP schemes\n- CVE-2019-12523: reject URIs with invalid scheme (non-alpha first char) and\n  malformed URN NID\n- CVE-2019-12526: add Must() guard in URN response handling to prevent\n  re-entry with zero-length buffer\n- CVE-2019-12528: fix FTP directory listing parser info leak from heap into\n  HTTP responses\n- CVE-2019-12529: fix Basic auth uudecode out-of-bounds read/write via proper\n  bounds checking\n- CVE-2019-13345: fix multiple XSS issues in cachemgr.cgi via rfc1738-escaping\n  user_name and auth parameters\n- CVE-2019-18676: cap URI scheme length and reject malformed scheme prefixes\n  to prevent buffer overflow in urlParse\n- CVE-2019-18677: prevent CSRF via append_domain truncation by rejecting\n  oversized domain appends\n- CVE-2019-18678: reject HTTP headers with whitespace between field-name and\n  colon per RFC 7230 to prevent request splitting\n- CVE-2019-18679: remove raw heap pointer from Digest nonce hash input to\n  prevent information disclosure and ASLR bypass\n- CVE-2019-18860: fix cachemgr.cgi XSS/info-disclosure via hostname parameter\n  validation","status":"published","published":"2026-04-23T18:38:25Z","modified":"2026-06-01T00:33:26.251745206Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1777539404","title":"squid34: Fix of 12 CVEs","description":"- CVE-2019-12525: fix heap buffer over-read in Digest auth parameter parsing\n- CVE-2018-1000027: fix NULL pointer dereference in X-Forwarded-For logging for internal transactions\n- CVE-2018-19131: escape certificate field injection via %D in ERR_SECURE_CONNECT_FAIL page\n- CVE-2018-19132: fix memory leak when parsing denied or malformed SNMP packets\n- CVE-2019-13345: escape user_name and pub_auth parameters in cachemgr.cgi to prevent reflected XSS\n- CVE-2019-18860: validate hostname parameter in cachemgr.cgi to prevent reflected XSS\n- CVE-2019-18677: prevent hostname truncation when append_domain expands origin-relative domains\n- CVE-2019-18679: remove in-memory pointer from Digest nonce hash input (ASLR bypass)\n- CVE-2019-18678: reject HTTP requests with BWS between header field-name and colon (RFC 7230 3.2.4)\n- CVE-2019-12523: validate URN NID per RFC 8141 to prevent SSRF via crafted urn: requests\n- CVE-2019-12528: track FTP listing token positions to avoid strstr-based over-read into adjacent heap\n- CVE-2019-12529: replace uudecode with base64_decode in Basic auth to bound input-buffer reads","status":"published","published":"2026-04-30T08:56:49Z","modified":"2026-10-21T10:48:12.180143482Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1777541147","title":"squid34: Fix of 12 CVEs","description":"- CVE-2019-12525: fix heap buffer over-read in Digest auth parameter parsing\n- CVE-2018-1000027: fix NULL pointer dereference in X-Forwarded-For logging for internal transactions\n- CVE-2018-19131: escape certificate field injection via %D in ERR_SECURE_CONNECT_FAIL page\n- CVE-2018-19132: fix memory leak when parsing denied or malformed SNMP packets\n- CVE-2019-13345: escape user_name and pub_auth parameters in cachemgr.cgi to prevent reflected XSS\n- CVE-2019-18860: validate hostname parameter in cachemgr.cgi to prevent reflected XSS\n- CVE-2019-18677: prevent hostname truncation when append_domain expands origin-relative domains\n- CVE-2019-18679: remove in-memory pointer from Digest nonce hash input (ASLR bypass)\n- CVE-2019-18678: reject HTTP requests with BWS between header field-name and colon (RFC 7230 3.2.4)\n- CVE-2019-12523: validate URN NID per RFC 8141 to prevent SSRF via crafted urn: requests\n- CVE-2019-12528: track FTP listing token positions to avoid strstr-based over-read into adjacent heap\n- CVE-2019-12529: replace uudecode with base64_decode in Basic auth to bound input-buffer reads","status":"published","published":"2026-05-02T01:02:36Z","modified":"2026-10-21T10:47:49.998050891Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"DLA-1266-1","title":"squid3 - security update","status":"published","published":"2018-02-02T00:00:00Z","modified":"2026-03-09T01:00:48.360573Z","updated_at":"2026-11-02T15:46:09.336894Z"},{"id":"DLA-1267-1","title":"squid - security update","status":"published","published":"2018-02-02T00:00:00Z","modified":"2026-03-09T01:01:00.496532Z","updated_at":"2026-11-02T15:46:09.336894Z"},{"id":"DSA-4122-1","title":"squid3 - security update","status":"published","published":"2018-02-23T00:00:00Z","modified":"2026-03-09T01:18:53.013984Z","updated_at":"2026-11-02T15:46:16.862196Z"},{"id":"openSUSE-SU-2024:11403-1","title":"squid-4.16-1.5 on GA media","description":"These are all security issues fixed in the squid-4.16-1.5 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:28:26.444707Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2018:0636-1","title":"Security update for squid","description":"This update for squid fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-1000024: DoS fix caused by incorrect pointer handling when processing ESI\n  responses. This affects the default custom esi_parser (bsc#1077003).\n- CVE-2018-1000027: DoS fix caused by incorrect pointer handing whien processing ESI\n  responses or downloading intermediate CA certificates (bsc#1077006).\n","status":"published","published":"2018-03-08T17:06:50Z","modified":"2026-02-04T03:55:41.213122Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"SUSE-SU-2018:0752-1","title":"Security update for squid3","description":"This update for squid3 fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-1000024: DoS fix caused by incorrect pointer handling when processing ESI\n  responses. This affects the default custom esi_parser (bsc#1077003).\n- CVE-2018-1000027: DoS fix caused by incorrect pointer handing whien processing ESI\n  responses or downloading intermediate CA certificates (bsc#1077006).\n","status":"published","published":"2018-03-21T09:24:57Z","modified":"2026-02-04T03:49:20.193729Z","updated_at":"2026-11-02T15:53:44.594517Z"},{"id":"USN-3557-1","title":"squid3 vulnerabilities","description":"Mathias Fischer discovered that Squid incorrectly handled certain long\nstrings in headers. A malicious remote server could possibly cause Squid to\ncrash, resulting in a denial of service. This issue was only addressed in\nUbuntu 16.04 LTS. (CVE-2016-2569)\n\nWilliam Lima discovered that Squid incorrectly handled XML parsing when\nprocessing Edge Side Includes (ESI). A malicious remote server could\npossibly cause Squid to crash, resulting in a denial of service. This issue\nwas only addressed in Ubuntu 16.04 LTS. (CVE-2016-2570)\n\nAlex Rousskov discovered that Squid incorrectly handled response-parsing\nfailures. A malicious remote server could possibly cause Squid to crash,\nresulting in a denial of service. This issue only applied to Ubuntu 16.04\nLTS. (CVE-2016-2571)\n\nSantiago Ruano Rincón discovered that Squid incorrectly handled certain\nVary headers. A remote attacker could possibly use this issue to cause\nSquid to crash, resulting in a denial of service. This issue was only\naddressed in Ubuntu 16.04 LTS. (CVE-2016-3948)\n\nLouis Dion-Marcil discovered that Squid incorrectly handled certain Edge\nSide Includes (ESI) responses. A malicious remote server could possibly\ncause Squid to crash, resulting in a denial of service. (CVE-2018-1000024)\n\nLouis Dion-Marcil discovered that Squid incorrectly handled certain Edge\nSide Includes (ESI) responses. A malicious remote server could possibly\ncause Squid to crash, resulting in a denial of service. (CVE-2018-1000027)\n","status":"published","published":"2018-02-05T18:09:07Z","modified":"2026-02-10T04:41:16Z","updated_at":"2026-11-02T16:58:13.496563Z"}]}}