{"id":"CVE-2017-0261","published":"2017-05-12T14:29:04Z","modified":"2026-06-17T00:57:21Z","title":"Microsoft Office Use-After-Free Vulnerability","vendor":"Microsoft","product":"Office","tier":"core","eol":null,"description":{"text":"Microsoft Office 2010 SP2, Office 2013 SP1, and Office 2016 allow a remote code execution vulnerability when the software fails to properly handle objects in memory, aka \"Office Remote Code Execution Vulnerability\". This CVE ID is unique from CVE-2017-0262 and CVE-2017-0281.","provenance":"source","from":"NVD"},"summary":null,"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.7813,"percentile":0.99575,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-24","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2017-0261","provenance":"source"},"vulncheckKev":{"dateAdded":"2017-05-09","exploitedFirstSeen":"2017-05-09","ransomware":false,"evidence":[{"url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2017-May","date":"2017-05-09"},{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2017-05-09"},{"url":"https://www.fireeye.com/blog/threat-research/2017/05/eps-processing-zero-days.html","date":"2017-05-09"},{"url":"https://dl.acm.org/doi/pdf/10.1145/3465481.3465758","date":"2021-08-17"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-03-03"},{"url":"https://www.pwc.com/gx/en/issues/cybersecurity/cyber-threat-intelligence/cyber-year-in-retrospect/yir-cyber-threats-report-download.pdf","date":"2022-04-26"},{"url":"https://securelist.com/apt-trends-report-q3-2022/107787/","date":"2022-11-01"},{"url":"https://strapi.eurepoc.eu/uploads/Eu_Repo_C_APT_profile_Turla_c9c7d8ed38.pdf","date":"2022-12-15"},{"url":"https://strapi.eurepoc.eu/uploads/Eu_Repo_C_APT_profile_APT_28_4856c0a0ac.pdf","date":"2023-02-05"}],"evidenceTotal":9,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"references":[{"url":"http://www.securityfocus.com/bid/98104","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1038444","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0261","tags":["Patch","Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/98104","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1038444","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0261","tags":["Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-0261","tags":["US Government Resource"]}],"techniques":[{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve","ai-mapping"],"basisDetail":"CTID attack_to_cve (Phase 1); claude-haiku-5-5: Use-after-free yields code execution via Office document","mappingType":"uncategorized","evidence":[{"from":"description","quote":"allow a remote code execution vulnerability when the software fails to properly handle objects in memory","start":60,"end":164}],"confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1204.002","name":"Malicious File","tactics":["execution"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve","ai-mapping"],"basisDetail":"CTID attack_to_cve (Phase 1); claude-haiku-5-5: CVSS UI:R means user must open document","mappingType":"uncategorized","evidence":[{"from":"description","quote":"allow a remote code execution vulnerability when the software fails to properly handle objects in memory","start":60,"end":164}],"confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2017-0617","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-0617","exploited":true,"exploitedSince":"2022-03-03","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":0,"earliest":"2019-03-31","earliestUrl":"https://github.com/kcufId/eps-CVE-2017-0261","repos":[{"name":"kcufId/eps-CVE-2017-0261","url":"https://github.com/kcufId/eps-CVE-2017-0261","stars":10,"created":"2019-03-31"},{"name":"erfze/CVE-2017-0261","url":"https://github.com/erfze/CVE-2017-0261","stars":0,"created":"2020-08-22"}]},"first":{"date":"2019-03-31","source":"PoC-in-GitHub","url":"https://github.com/kcufId/eps-CVE-2017-0261"},"provenance":"source"},"detections":{"cveRules":[{"title":"Exploit for CVE-2017-0261","id":"864403a1-36c9-40a2-a982-4c9a45f7d833","level":"medium","status":"test","path":"rules-emerging-threats/2017/Exploits/CVE-2017-0261/proc_creation_win_exploit_cve_2017_0261.yml","url":"https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2017/Exploits/CVE-2017-0261/proc_creation_win_exploit_cve_2017_0261.yml","techniques":["T1203","T1204.002","T1566.001"]}]},"exploitRefs":[],"flow":[{"stage":"related","techniques":["T1203","T1204.002"],"provenance":"source"}],"timeline":[{"date":"2017-05-09","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2017-May","provenance":"source"},{"date":"2017-05-12","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-0261","provenance":"source"},{"date":"2019-03-31","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/kcufId/eps-CVE-2017-0261","provenance":"source"},{"date":"2022-03-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-03-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-0617","provenance":"source"}],"speed":{"daysToPublicExploit":688,"firstExploitFrom":"PoC-in-GitHub","daysToKev":1756},"priority":{"score":68.4,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 3460 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.91,"detail":"percentile 0.9958"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.46,"detail":"base score 7.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-microsoft-office-cwe-416"}}