{"id":"CVE-2020-8450","aliases":["ALPINE-CVE-2020-8450","ALSA-2020:4743","CLSA-2021-1628782974","CLSA-2021-1632262221","CLSA-2021-1634925554","CLSA-2021-1634925634","DEBIAN-CVE-2020-8450","DLA-2278-1","DSA-4682-1","EUVD-2020-29316","GHSA-vrcq-r42v-wc44","MGASA-2020-0106","RHSA-2020:4082","RHSA-2020:4743","RLSA-2020:4743","SUSE-SU-2020:0487-1","SUSE-SU-2020:0493-1","SUSE-SU-2020:0661-1","SUSE-SU-2020:14460-1","UBUNTU-CVE-2020-8450","USN-4289-1","openSUSE-SU-2020:0307-1","openSUSE-SU-2020:0606-1"],"status":"published","title":"An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client...","description":"An issue was discovered in Squid before 4.10. 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Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.","status":"published","published":"2020-02-04T19:51:21Z","modified":"2024-08-04T09:56:28.485Z","updated_at":"2026-11-02T14:35:50.88562Z"}],"euvd":[{"id":"EUVD-2020-29316","description":"An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.","status":"published","published":"2020-02-04T19:51:21Z","modified":"2024-08-04T09:56:28Z","updated_at":"2026-11-03T03:07:57.14802Z"}],"ghsa":[{"id":"GHSA-vrcq-r42v-wc44","title":"An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client...","description":"An issue was discovered in Squid before 4.10. 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Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.","status":"published","published":"2020-02-04T20:15:14.777Z","modified":"2026-10-26T11:17:55.185777753Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:27:48.11886Z"},{"id":"CVE-2020-8450","description":"An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.","status":"published","published":"2020-02-04T20:15:14.777Z","modified":"2026-10-24T10:30:37.70761316Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"DEBIAN-CVE-2020-8450","description":"An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.","status":"published","published":"2020-02-04T20:15:14.777Z","modified":"2026-10-26T12:02:33.316672386Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:45:34.311861Z"},{"id":"RHSA-2020:4082","title":"Red Hat Security Advisory: squid security update","status":"published","published":"2024-09-16T04:42:01Z","modified":"2026-06-26T10:50:48Z","cvss":[{"version":"3.1","score":9.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"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-2020-8450","description":"An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.","status":"published","published":"2020-02-04T20:15:00Z","modified":"2026-02-04T02:57:41.900015Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"updated_at":"2026-11-02T15:54:25.728622Z"},{"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-2021-1628782974","title":"Fix of CVE: CVE-2020-8450, CVE-2020-8517, CVE-2020-8449","description":"- CVE-2020-8449: fix improper HTTP request validation allowing access to \n  resources which are prohibited by security filters\n- CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow\n- CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer\n  and leading to denial of service","status":"published","published":"2021-08-12T15:42:54Z","modified":"2026-10-21T10:47:12.000486085Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1632262221","title":"Fix of CVE: CVE-2020-8517, CVE-2021-28651, CVE-2020-15049, CVE-2020-8449, CVE-2020-8450, CVE-2020-24606, CVE-2020-25097, CVE-2020-11945, CVE-2020-14058","description":"- CVE-2020-15049: fix incorrect validation of Content-Length field leading to\n  Http smuggling and Poisoning attack\n- CVE-2020-14058: fix handling of unknown SSL errors which resulted in denial of\n  service\n- CVE-2020-25097: fix improper input validation allowing HTTP smuggling from\n  trusted client\n- CVE-2020-11945: fix nonce reference counter overflow allowing replay attack\n- CVE-2020-24606: fix handle of EOF in peerDigestHandleReply() leading to Denial\n  of service\n- CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer\n  and leading to denial of service\n- CVE-2020-8449: fix improper HTTP request validation allowing access to \n  resources which are prohibited by security filters\n- CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow\n- CVE-2021-28651: fix memory leak leading to denial of service","status":"published","published":"2021-09-21T22:10:21Z","modified":"2026-10-21T10:47:14.734923034Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1634925554","title":"Fixed CVEs in squid: CVE-2020-8517, CVE-2020-8450, CVE-2020-8449","description":"- CVE-2020-8449: fix improper HTTP request validation allowing access to \n  resources which are prohibited by security filters\n- CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow\n- CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer\n  and leading to denial of service","status":"published","published":"2021-10-22T17:59:14Z","modified":"2026-10-21T10:47:02.318133266Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"id":"CLSA-2021-1634925634","title":"Fixed 9 CVEs in squid34","description":"- CVE-2020-15049: fix incorrect validation of Content-Length field leading to\n  Http smuggling and Poisoning attack\n- CVE-2020-14058: fix handling of unknown SSL errors which resulted in denial of\n  service\n- CVE-2020-25097: fix improper input validation allowing HTTP smuggling from\n  trusted client\n- CVE-2020-11945: fix nonce reference counter overflow allowing replay attack\n- CVE-2020-24606: fix handle of EOF in peerDigestHandleReply() leading to Denial\n  of service\n- CVE-2020-8517: fix incorrect input validation allowing writing outside of buffer\n  and leading to denial of service\n- CVE-2020-8449: fix improper HTTP request validation allowing access to \n  resources which are prohibited by security filters\n- CVE-2020-8450: fix incorrect buffer managment leading to buffer overflow\n- CVE-2021-28651: fix memory leak leading to denial of service","status":"published","published":"2021-10-22T18:00:34Z","modified":"2026-10-21T10:46:44.702745805Z","updated_at":"2026-11-02T15:43:39.801198Z"},{"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":"MGASA-2020-0106","title":"Updated squid packages fix security vulnerabilities","description":"Updated squid packages fix security vulnerabilities:\n\nJeriko One discovered that Squid incorrectly handled memory when connected\nto an FTP server. A remote attacker could possibly use this issue to obtain\nsensitive information from Squid memory (CVE-2019-12528).\n\nRegis Leroy discovered that Squid incorrectly handled certain HTTP requests.\nA remote attacker could possibly use this issue to access server resources\nprohibited by earlier security filters (CVE-2020-8449).\n\nGuido Vranken discovered that Squid incorrectly handled certain buffer\noperations when acting as a reverse proxy. A remote attacker could use this\nissue to cause Squid to crash, resulting in a denial of service, or possibly\nexecute arbitrary code (CVE-2020-8450).\n\nAaron Costello discovered that Squid incorrectly handled certain NTLM\nauthentication credentials. A remote attacker could possibly use this issue\nto cause Squid to crash, resulting in a denial of service (CVE-2020-8517).\n","status":"published","published":"2020-02-26T10:21:01Z","modified":"2026-04-16T04:43:10.521942049Z","updated_at":"2026-11-02T15:49:41.151324Z"},{"id":"openSUSE-SU-2020:0307-1","title":"Security update for squid","description":"This update for squid to version 4.10 fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).\n- CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n\nNon-security issue fixed:\n\n- Improved cache handling with chunked responses.\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-03-05T23:16:01Z","modified":"2026-02-04T04:00:18.719008Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"openSUSE-SU-2020:0606-1","title":"Security update for squid","description":"This update for squid to version 4.10 fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).\n- CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n\nNon-security issue fixed:\n\n- Improved cache handling with chunked responses.\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-05-03T10:32:46Z","modified":"2026-02-04T02:18:04.290161Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"SUSE-SU-2020:0487-1","title":"Security update for squid","description":"This update for squid to version 4.10 fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).\n- CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n\nNon-security issue fixed:\n\n- Improved cache handling with chunked responses.\n","status":"published","published":"2020-02-26T10:43:20Z","modified":"2025-05-02T04:08:43.736121Z","updated_at":"2026-11-02T15:53:47.06185Z"},{"id":"SUSE-SU-2020:0493-1","title":"Security update for squid","description":"This update for squid to version 4.10 fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689).\n- CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\n\nNon-security issue fixed:\n\n- Improved cache handling with chunked responses.\n","status":"published","published":"2020-02-26T13:05:55Z","modified":"2026-02-04T02:39:33.404265Z","updated_at":"2026-11-02T15:53:47.06185Z"},{"id":"SUSE-SU-2020:0661-1","title":"Security update for squid","description":"This update for squid fixes the following issues:\n\n- CVE-2019-12528: Fixed an information disclosure flaw in the FTP gateway (bsc#1162689). \n- CVE-2019-12526: Fixed potential remote code execution during URN processing (bsc#1156326).\n- CVE-2019-12523,CVE-2019-18676: Fixed multiple improper validations in URI processing (bsc#1156329).\n- CVE-2019-18677: Fixed Cross-Site Request Forgery in HTTP Request processing (bsc#1156328).\n- CVE-2019-18678: Fixed incorrect message parsing which could have led to HTTP request splitting issue (bsc#1156323).\n- CVE-2019-18679: Fixed information disclosure when processing HTTP Digest Authentication (bsc#1156324).\n- CVE-2020-8449: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8450: Fixed a buffer overflow when squid is acting as reverse-proxy (bsc#1162687).\n- CVE-2020-8517: Fixed a buffer overflow in ext_lm_group_acl when processing NTLM Authentication credentials (bsc#1162691).\t  \n","status":"published","published":"2020-03-12T16:01:37Z","modified":"2026-02-04T03:24:31.697905Z","updated_at":"2026-11-02T15:53:47.06185Z"},{"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-4289-1","title":"squid, squid3 vulnerabilities","description":"Jeriko One discovered that Squid incorrectly handled memory when connected\nto an FTP server. A remote attacker could possibly use this issue to obtain\nsensitive information from Squid memory. (CVE-2019-12528)\n\nRegis Leroy discovered that Squid incorrectly handled certain HTTP\nrequests. A remote attacker could possibly use this issue to access server\nresources prohibited by earlier security filters. (CVE-2020-8449)\n\nGuido Vranken discovered that Squid incorrectly handled certain buffer\noperations when acting as a reverse proxy. A remote attacker could use\nthis issue to cause Squid to crash, resulting in a denial of service, or\npossibly execute arbitrary code. (CVE-2020-8450)\n\nAaron Costello discovered that Squid incorrectly handled certain NTLM\nauthentication credentials. A remote attacker could possibly use this issue\nto cause Squid to crash, resulting in a denial of service. (CVE-2020-8517)\n","status":"published","published":"2020-02-20T15:17:45Z","modified":"2026-02-10T04:41:47Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}