{"api_version":"1","generated_at":"2026-04-23T01:00:20+00:00","cve":"CVE-2021-27135","urls":{"html":"https://cve.report/CVE-2021-27135","api":"https://cve.report/api/cve/CVE-2021-27135.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-27135","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27135"},"summary":{"title":"CVE-2021-27135","description":"xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-02-10 16:15:00","updated_at":"2023-11-07 03:31:00"},"problem_types":["NVD-CWE-noinfo"],"metrics":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/02/10/7","name":"[oss-security] 20210210 Re: Re: screen crash processing combining characters","refsource":"MLIST","tags":["Mailing List","Third Party Advisory"],"title":"oss-security - Re: Re: screen crash processing combining characters","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1182091","name":"https://bugzilla.suse.com/show_bug.cgi?id=1182091","refsource":"CONFIRM","tags":[],"title":"Bug 1182091 – VUL-0: CVE-2021-27135: xterm: crash when processing combining characters","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://access.redhat.com/security/cve/CVE-2021-27135","name":"https://access.redhat.com/security/cve/CVE-2021-27135","refsource":"MISC","tags":[],"title":"Red Hat Customer Portal - Access to 24x7 support and knowledge","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://security.gentoo.org/glsa/202208-22","name":"GLSA-202208-22","refsource":"GENTOO","tags":[],"title":"xterm: Multiple Vulnerabilities (GLSA 202208-22) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/","name":"FEDORA-2021-e7a8e79fa8","refsource":"FEDORA","tags":["Mailing List","Patch","Third Party Advisory"],"title":"[SECURITY] Fedora 33 Update: xterm-366-1.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://www.openwall.com/lists/oss-security/2021/02/09/9","name":"https://www.openwall.com/lists/oss-security/2021/02/09/9","refsource":"MISC","tags":["Mailing List","Third Party Advisory"],"title":"oss-security - Re: screen crash processing combining characters","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://invisible-island.net/xterm/xterm.log.html","name":"https://invisible-island.net/xterm/xterm.log.html","refsource":"CONFIRM","tags":[],"title":"XTERM - Change Log","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/","name":"FEDORA-2021-e7a8e79fa8","refsource":"","tags":[],"title":"[SECURITY] Fedora 33 Update: xterm-366-1.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://news.ycombinator.com/item?id=26524650","name":"https://news.ycombinator.com/item?id=26524650","refsource":"MISC","tags":[],"title":"CVE-2021-27135: xterm flaw may allow remote code execution, CVSS 9.6 | Hacker News","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html","name":"[debian-lts-announce] 20210213 [SECURITY] [DLA 2558-1] xterm security update","refsource":"MLIST","tags":["Mailing List","Third Party Advisory"],"title":"[SECURITY] [DLA 2558-1] xterm security update","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1927559","name":"https://bugzilla.redhat.com/show_bug.cgi?id=1927559","refsource":"MISC","tags":[],"title":"1927559 – (CVE-2021-27135) CVE-2021-27135 xterm: crash when processing combining characters","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c","name":"https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c","refsource":"CONFIRM","tags":[],"title":"snapshot of project \"xterm\", label xterm-365d · ThomasDickey/xterm-snapshots@82ba55b · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.openwall.com/lists/oss-security/2021/02/09/7","name":"https://www.openwall.com/lists/oss-security/2021/02/09/7","refsource":"MISC","tags":["Mailing List","Third Party Advisory"],"title":"oss-security - Re: screen crash processing combining characters","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://seclists.org/fulldisclosure/2021/May/52","name":"20210520 CVE-2021-31535 libX11 Insufficient Length Checks PoC and Archeology","refsource":"FULLDISC","tags":[],"title":"Full Disclosure: CVE-2021-31535 libX11 Insufficient Length Checks PoC and\tArcheology","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-27135","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27135","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"27135","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"27135","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"27135","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"33","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"27135","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"33","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"27135","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"invisible-island","cpe5":"xterm","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"27135","vulnerable":"1","versionEndIncluding":"365","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"invisible-island","cpe5":"xterm","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-27135","qid":"178498","title":"Debian Security Update for xterm (DLA 2558-2)"},{"cve":"CVE-2021-27135","qid":"180330","title":"Debian Security Update for xterm (CVE-2021-27135)"},{"cve":"CVE-2021-27135","qid":"257083","title":"CentOS Security Update for xterm (CESA-2021:0617)"},{"cve":"CVE-2021-27135","qid":"296067","title":"Oracle Solaris 11.4 Support Repository Update (SRU) 33.94.0 Missing (CPUAPR2021)"},{"cve":"CVE-2021-27135","qid":"352241","title":"Amazon Linux Security Advisory for xterm: ALAS-2021-1489"},{"cve":"CVE-2021-27135","qid":"352249","title":"Amazon Linux Security Advisory for xterm: ALAS2-2021-1619"},{"cve":"CVE-2021-27135","qid":"376877","title":"Alibaba Cloud Linux Security Update for xterm (ALINUX2-SA-2021:0010)"},{"cve":"CVE-2021-27135","qid":"377119","title":"Alibaba Cloud Linux Security Update for xterm (ALINUX3-SA-2021:0010)"},{"cve":"CVE-2021-27135","qid":"501724","title":"Alpine Linux Security Update for xterm"},{"cve":"CVE-2021-27135","qid":"501945","title":"Alpine Linux Security Update for xterm"},{"cve":"CVE-2021-27135","qid":"505591","title":"Alpine Linux Security Update for xterm"},{"cve":"CVE-2021-27135","qid":"670211","title":"EulerOS Security Update for xterm (EulerOS-SA-2021-1864)"},{"cve":"CVE-2021-27135","qid":"670310","title":"EulerOS Security Update for xterm (EulerOS-SA-2021-1914)"},{"cve":"CVE-2021-27135","qid":"670331","title":"EulerOS Security Update for xterm (EulerOS-SA-2021-1893)"},{"cve":"CVE-2021-27135","qid":"670843","title":"EulerOS Security Update for xterm (EulerOS-SA-2021-1864)"},{"cve":"CVE-2021-27135","qid":"710689","title":"Gentoo Linux xterm Multiple Vulnerabilities (GLSA 202208-22)"},{"cve":"CVE-2021-27135","qid":"730121","title":"McAfee Web Gateway Multiple Vulnerabilities (WP-3484,WP-3744,WP-3745,WP-3746,WP-3747,WP-3793,WP-3800)"},{"cve":"CVE-2021-27135","qid":"750666","title":"SUSE Enterprise Linux Security Update for xterm (SUSE-SU-2021:2011-1)"},{"cve":"CVE-2021-27135","qid":"750669","title":"SUSE Enterprise Linux Security Update for xterm (SUSE-SU-2021:2014-1)"},{"cve":"CVE-2021-27135","qid":"750670","title":"SUSE Enterprise Linux Security Update for xterm (SUSE-SU-2021:2013-1)"},{"cve":"CVE-2021-27135","qid":"750704","title":"OpenSUSE Security Update for xterm (openSUSE-SU-2021:0900-1)"},{"cve":"CVE-2021-27135","qid":"750820","title":"OpenSUSE Security Update for xterm (openSUSE-SU-2021:2011-1)"},{"cve":"CVE-2021-27135","qid":"901553","title":"Common Base Linux Mariner (CBL-Mariner) Security Update for xterm (7454)"},{"cve":"CVE-2021-27135","qid":"903789","title":"Common Base Linux Mariner (CBL-Mariner) Security Update for xterm (7454-1)"},{"cve":"CVE-2021-27135","qid":"940093","title":"AlmaLinux Security Update for xterm (ALSA-2021:0611)"},{"cve":"CVE-2021-27135","qid":"960687","title":"Rocky Linux Security Update for xterm (RLSA-2021:0611)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-27135","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://www.openwall.com/lists/oss-security/2021/02/09/7","refsource":"MISC","name":"https://www.openwall.com/lists/oss-security/2021/02/09/7"},{"url":"https://www.openwall.com/lists/oss-security/2021/02/09/9","refsource":"MISC","name":"https://www.openwall.com/lists/oss-security/2021/02/09/9"},{"refsource":"MLIST","name":"[oss-security] 20210210 Re: Re: screen crash processing combining characters","url":"http://www.openwall.com/lists/oss-security/2021/02/10/7"},{"refsource":"MLIST","name":"[debian-lts-announce] 20210213 [SECURITY] [DLA 2558-1] xterm security update","url":"https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html"},{"refsource":"FEDORA","name":"FEDORA-2021-e7a8e79fa8","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/"},{"refsource":"MISC","name":"https://news.ycombinator.com/item?id=26524650","url":"https://news.ycombinator.com/item?id=26524650"},{"refsource":"MISC","name":"https://access.redhat.com/security/cve/CVE-2021-27135","url":"https://access.redhat.com/security/cve/CVE-2021-27135"},{"refsource":"MISC","name":"https://bugzilla.redhat.com/show_bug.cgi?id=1927559","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1927559"},{"refsource":"CONFIRM","name":"https://invisible-island.net/xterm/xterm.log.html","url":"https://invisible-island.net/xterm/xterm.log.html"},{"refsource":"CONFIRM","name":"https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c","url":"https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c"},{"refsource":"CONFIRM","name":"https://bugzilla.suse.com/show_bug.cgi?id=1182091","url":"https://bugzilla.suse.com/show_bug.cgi?id=1182091"},{"refsource":"FULLDISC","name":"20210520 CVE-2021-31535 libX11 Insufficient Length Checks PoC and Archeology","url":"http://seclists.org/fulldisclosure/2021/May/52"},{"refsource":"GENTOO","name":"GLSA-202208-22","url":"https://security.gentoo.org/glsa/202208-22"}]}},"nvd":{"publishedDate":"2021-02-10 16:15:00","lastModifiedDate":"2023-11-07 03:31:00","problem_types":["NVD-CWE-noinfo"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL"},"exploitabilityScore":3.9,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":7.5},"severity":"HIGH","exploitabilityScore":10,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:invisible-island:xterm:*:*:*:*:*:*:*:*","versionEndExcluding":"366","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"27135","Ordinal":"202220","Title":"CVE-2021-27135","CVE":"CVE-2021-27135","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"27135","Ordinal":"1","NoteData":"xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"27135","Ordinal":"2","NoteData":"2021-02-10","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"27135","Ordinal":"3","NoteData":"2021-05-21","Type":"Other","Title":"Modified"}]}}}