{"id":"CVE-2019-12521","aliases":["ALPINE-CVE-2019-12521","ALSA-2020:4743","CLSA-2026-1777384121","CLSA-2026-1777446517","DEBIAN-CVE-2019-12521","DLA-2278-1","DSA-4682-1","EUVD-2019-4116","GHSA-7mv4-9v7r-5gq3","OESA-2022-1851","RHSA-2020:4743","RLSA-2020:4743","SUSE-SU-2020:1134-1","SUSE-SU-2020:1156-1","SUSE-SU-2020:1227-1","SUSE-SU-2020:14460-1","UBUNTU-CVE-2019-12521","USN-4356-1","openSUSE-SU-2020:0623-1"],"status":"published","title":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI...","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. 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issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T18:47:43Z","modified":"2024-08-04T23:24:38.85Z","updated_at":"2026-11-02T14:20:24.025419Z"}],"euvd":[{"id":"EUVD-2019-4116","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T18:47:43Z","modified":"2024-08-04T23:24:38Z","updated_at":"2026-11-03T02:40:45.434408Z"}],"ghsa":[{"id":"GHSA-7mv4-9v7r-5gq3","title":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI...","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2022-05-24T17:14:19Z","modified":"2023-01-29T05:02:04Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:44:59.173471Z"}],"nvd":[{"id":"CVE-2019-12521","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T19:15:12.393Z","modified":"2026-06-17T02:14:48.837Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-193","CWE-787"],"updated_at":"2026-11-02T14:05:46.451008Z"}],"osv":[{"id":"ALPINE-CVE-2019-12521","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T19:15:12.393Z","modified":"2026-09-21T06:17:52.465321917Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:27:47.663013Z"},{"id":"CVE-2019-12521","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T19:15:12.393Z","modified":"2026-10-24T10:30:29.575676977Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:10.718934Z"},{"id":"DEBIAN-CVE-2019-12521","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T19:15:12.393Z","modified":"2026-09-21T07:01:48.993541433Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:31.467893Z"},{"id":"OESA-2022-1851","title":"squid security update","description":"Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests.\r\n\r\nSecurity Fix(es):\r\n\r\nAn issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it s off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can t affect adjacent memory blocks, and thus just leads to a crash while processing.(CVE-2019-12521)","status":"published","published":"2022-08-19T11:05:07Z","modified":"2026-08-18T01:17:08.077466904Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"RHSA-2020:4743","title":"Red Hat Security Advisory: squid:4 security, bug fix, and enhancement update","status":"published","published":"2024-09-16T04:22:06Z","modified":"2026-07-04T10:01:03Z","cvss":[{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RLSA-2020:4743","title":"Moderate: squid:4 security, bug fix, and enhancement update","description":"Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nThe following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)\n\nSecurity Fix(es):\n\n* squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)\n\n* squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)\n\n* squid: Improper input validation in URI processor (CVE-2019-12523)\n\n* squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)\n\n* squid: Heap overflow issue in URN processing (CVE-2019-12526)\n\n* squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)\n\n* squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)\n\n* squid: Denial of service in cachemgr.cgi (CVE-2019-12854)\n\n* squid: Buffer overflow in URI processor (CVE-2019-18676)\n\n* squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)\n\n* squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)\n\n* squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)\n\n* squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)\n\n* squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)\n\n* squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)\n\n* squid: DoS in TLS handshake (CVE-2020-14058)\n\n* squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)\n\n* squid: Improper input validation could result in a DoS (CVE-2020-24606)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Rocky Linux 8.3 Release Notes linked from the References section.","status":"published","published":"2020-11-03T12:32:17Z","modified":"2026-02-04T20:00:07.394661Z","cvss":[{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2019-12521","description":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.","status":"published","published":"2020-04-15T19:15:00Z","modified":"2026-02-04T03:49:25.391703Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:19.202697Z"},{"id":"ALSA-2020:4743","title":"Moderate: squid:4 security, bug fix, and enhancement update","description":"Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.\n\nThe following packages have been upgraded to a later upstream version: squid (4.11). (BZ#1829467)\n\nSecurity Fix(es):\n\n* squid: Improper input validation in request allows for proxy manipulation (CVE-2019-12520)\n\n* squid: Off-by-one error in addStackElement allows for heap buffer overflow and crash (CVE-2019-12521)\n\n* squid: Improper input validation in URI processor (CVE-2019-12523)\n\n* squid: Improper access restriction in url_regex may lead to security bypass (CVE-2019-12524)\n\n* squid: Heap overflow issue in URN processing (CVE-2019-12526)\n\n* squid: Information Disclosure issue in FTP Gateway (CVE-2019-12528)\n\n* squid: Out of bounds read in Proxy-Authorization header causes DoS (CVE-2019-12529)\n\n* squid: Denial of service in cachemgr.cgi (CVE-2019-12854)\n\n* squid: Buffer overflow in URI processor (CVE-2019-18676)\n\n* squid: Cross-Site Request Forgery issue in HTTP Request processing (CVE-2019-18677)\n\n* squid: HTTP Request Splitting issue in HTTP message processing (CVE-2019-18678)\n\n* squid: Information Disclosure issue in HTTP Digest Authentication (CVE-2019-18679)\n\n* squid: Mishandled HTML in the host parameter to cachemgr.cgi results in insecure behaviour (CVE-2019-18860)\n\n* squid: Improper input validation issues in HTTP Request processing (CVE-2020-8449)\n\n* squid: Buffer overflow in reverse-proxy configurations (CVE-2020-8450)\n\n* squid: DoS in TLS handshake (CVE-2020-14058)\n\n* squid: Request smuggling and poisoning attack against the HTTP cache (CVE-2020-15049)\n\n* squid: Improper input validation could result in a DoS (CVE-2020-24606)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2020-11-03T12:32:17Z","modified":"2026-10-29T11:00:17.827616275Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"CLSA-2026-1777384121","title":"squid: Fix of 3 CVEs","description":"- CVE-2019-12521: fix ESI parser off-by-one heap overflow by enforcing a\n  stack-depth limit and throwing on overflow\n- CVE-2019-12524 already addressed by the CVE-2019-12520 backport (same\n  fix upstream; see Squid advisory SQUID-2019:4)","status":"published","published":"2026-04-28T13:48:46Z","modified":"2026-10-21T10:48:11.836264808Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1777446517","title":"squid: Fix of 3 CVEs","description":"- CVE-2019-12521: fix ESI parser off-by-one heap overflow by enforcing a\n  stack-depth limit and throwing on overflow\n- CVE-2019-12524 already addressed by the CVE-2019-12520 backport (same\n  fix upstream; see Squid advisory SQUID-2019:4)","status":"published","published":"2026-04-29T07:08:43Z","modified":"2026-10-21T10:47:49.160953191Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"DLA-2278-1","title":"squid3 - security update","status":"published","published":"2020-07-10T00:00:00Z","modified":"2026-03-09T01:21:50.659924Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DSA-4682-1","title":"squid - security update","status":"published","published":"2020-05-08T00:00:00Z","modified":"2026-03-09T02:09:44.67451Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"openSUSE-SU-2020:0623-1","title":"Security update for squid","description":"This update for squid to version 4.11 fixes the following issues:\n\n- CVE-2020-11945: Fixed a potential remote code execution vulnerability when using\n  HTTP Digest Authentication (bsc#1170313).\n- CVE-2019-12519, CVE-2019-12521: Fixed incorrect buffer handling that can result \n  in cache poisoning, remote execution, and denial of service attacks when\n  processing ESI responses (bsc#1169659).\n- CVE-2020-8517: Fixed a possible denial of service caused by incorrect buffer\n  management ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n- CVE-2019-12528: Fixed possible information disclosure when translating\n  FTP server listings into HTTP responses (bsc#1162689).\n- CVE-2019-18860: Fixed handling of invalid domain names in cachemgr.cgi (bsc#1167373).\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-05-08T10:21:50Z","modified":"2026-02-04T03:05:38.483667Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"SUSE-SU-2020:1134-1","title":"Security update for squid","description":"This update for squid to version 4.11 fixes the following issues:\n\n- CVE-2020-11945: Fixed a potential remote code execution vulnerability when using\n  HTTP Digest Authentication (bsc#1170313).\n- CVE-2019-12519, CVE-2019-12521: Fixed incorrect buffer handling that can result \n  in cache poisoning, remote execution, and denial of service attacks when\n  processing ESI responses (bsc#1169659).\n- CVE-2020-8517: Fixed a possible denial of service caused by incorrect buffer\n  management ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n- CVE-2019-12528: Fixed possible information disclosure when translating\n  FTP server listings into HTTP responses (bsc#1162689).\n- CVE-2019-18860: Fixed handling of invalid domain names in cachemgr.cgi (bsc#1167373).\n","status":"published","published":"2020-04-29T05:50:38Z","modified":"2026-02-04T03:44:25.255594Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"SUSE-SU-2020:1156-1","title":"Security update for squid","description":"This update for squid to version 4.11 fixes the following issues:\n\n- CVE-2020-11945: Fixed a potential remote code execution vulnerability when using\n  HTTP Digest Authentication (bsc#1170313).\n- CVE-2019-12519, CVE-2019-12521: Fixed incorrect buffer handling that can result \n  in cache poisoning, remote execution, and denial of service attacks when\n  processing ESI responses (bsc#1169659).\n- CVE-2020-8517: Fixed a possible denial of service caused by incorrect buffer\n  management ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n- CVE-2019-12528: Fixed possible information disclosure when translating\n  FTP server listings into HTTP responses (bsc#1162689).\n- CVE-2019-18860: Fixed handling of invalid domain names in cachemgr.cgi (bsc#1167373).\n","status":"published","published":"2020-04-30T08:10:49Z","modified":"2026-02-04T02:41:26.675306Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"SUSE-SU-2020:1227-1","title":"Security update for squid","description":"This update for squid fixes the following issues:\n\n- CVE-2019-12519, CVE-2019-12521: fixes incorrect buffer handling that can \n  result in cache poisoning, remote execution, and denial of service attacks\n  when processing ESI responses (bsc#1169659).\n- CVE-2020-11945: fixes a potential remote execution vulnerability\n  when using HTTP Digest Authentication (bsc#1170313).\n- CVE-2019-12520, CVE-2019-12524: fixes a potential ACL bypass, cache-bypass\n  and cross-site scripting attack when processing invalid HTTP\n  Request messages (bsc#1170423).\n","status":"published","published":"2020-05-08T12:14:02Z","modified":"2026-02-04T04:32:03.327853Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"SUSE-SU-2020:14460-1","title":"Security update for squid3","description":"This update for squid3 fixes the following issues:\n\n- Fixed a Cache Poisoning and Request Smuggling\n  attack (CVE-2020-15049, bsc#1173455)\n- Fixed incorrect buffer handling that can\n  result in cache poisoning, remote execution, and\n  denial of service attacks when processing ESI responses\n  (CVE-2019-12519, CVE-2019-12521, bsc#1169659)\n\n- Fixed handling of hostname in\n  cachemgr.cgi (CVE-2019-18860, bsc#1167373)\n- Fixed a potential remote execution vulnerability\n  when using HTTP Digest Authentication (CVE-2020-11945, bsc#1170313)\n- Fixed a potential ACL bypass, cache-bypass\n  and cross-site scripting attack when processing invalid HTTP\n  Request messages (CVE-2019-12520, CVE-2019-12524, bsc#1170423)\n- Fixed a potential denial of service when\n  processing TLS certificates during HTTPS connections\n  (CVE-2020-14059, bsc#1173304)\n\n- Fixed a potential denial of service associated\n  with incorrect buffer management of HTTP Basic Authentication\n  credentials (bsc#1141329, CVE-2019-12529)\n- Fixed an incorrect buffer management resulting\n  in vulnerability to a denial of service during processing of\n  HTTP Digest Authentication credentials (bsc#1141332, CVE-2019-12525)\n- Fix XSS via user_name or auth parameter\n  in cachemgr.cgi (bsc#1140738, CVE-2019-13345)\n- Fixed a potential code execution vulnerability\n  (CVE-2019-12526, bsc#1156326)\n- Fixed HTTP Request Splitting in HTTP\n  message processing and information disclosure in\n  HTTP Digest Authentication\n  (CVE-2019-18678, CVE-2019-18679, bsc#1156323, bsc#1156324)\n- Fixed a security issue allowing a remote\n  client ability to cause use a buffer overflow when squid is\n  acting as reverse-proxy.\n  (CVE-2020-8449, CVE-2020-8450, bsc#1162687)\n- Fixed a security issue allowing for information\n  disclosure in FTP gateway (CVE-2019-12528, bsc#1162689)\n- Fixed a security issue in ext_lm_group_acl\n  when processing NTLM Authentication credentials.\n  (CVE-2020-8517, bsc#1162691)\n\n- Fixed Cross-Site Request Forgery in\n  HTTP Request processing (CVE-2019-18677, bsc#1156328)\n\n- Disable urn parsing and parsing of\n  unknown schemes (bsc#1156329, CVE-2019-12523, CVE-2019-18676)\n","status":"published","published":"2020-08-24T12:06:51Z","modified":"2025-05-02T04:08:43.365999Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"USN-4356-1","title":"squid, squid3 vulnerabilities","description":"Jeriko One discovered that Squid incorrectly handled certain Edge Side\nIncludes (ESI) responses. A malicious remote server could cause Squid to\ncrash, possibly poison the cache, or possibly execute arbitrary code.\n(CVE-2019-12519, CVE-2019-12521)\n\nIt was discovered that Squid incorrectly handled the hostname parameter to\ncachemgr.cgi when certain browsers are used. A remote attacker could\npossibly use this issue to inject HTML or invalid characters in the\nhostname parameter. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04\nLTS, and Ubuntu 19.10. (CVE-2019-18860)\n\nClément Berthaux and Florian Guilbert discovered that Squid incorrectly\nhandled Digest Authentication nonce values. A remote attacker could\nuse this issue to replay nonce values, or possibly execute arbitrary code.\n(CVE-2020-11945)\n","status":"published","published":"2020-05-13T11:37:20Z","modified":"2026-02-10T04:41:49Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}