{"schemaVersion":3,"id":"CVE-2020-0878","aliases":[],"status":"published","duplicateOf":null,"title":"Microsoft Edge and Internet Explorer Memory Corruption Vulnerability","description":"<p>A remote code execution vulnerability exists in the way that Microsoft browsers access objects in memory. The vulnerability could corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, the attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p>\n<p>An attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers, and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically via an enticement in email or instant message, or by getting them to open an email attachment.</p>\n<p>The security update addresses the vulnerability by modifying how Microsoft browsers handle objects in memory.</p>","dates":{"published":"2020-09-11T17:08:26.000Z","modified":"2025-10-21T23:35:36.572Z","reserved":null,"kevAdded":["2021-11-03T00:00:00.000Z"],"kevDue":["2022-05-03T00:00:00.000Z"]},"cvss":{"headline":{"score":5.1,"severity":"medium","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.2,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.2,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5.1,"severity":"medium","vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02696,"percentile":0.85718,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.02696},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.02696,"percentile":0.85718}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02696,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.02696,"percentile":0.85718}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2021-11-03T00:00:00.000Z","dueDate":"2022-05-03T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft Edge and Internet Explorer Memory Corruption Vulnerability","description":"Microsoft Edge and Internet Explorer contain a memory corruption vulnerability that allows attackers to execute code in the context of the current user.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2020-0878","label":"nvd.nist.gov/vuln/detail/CVE-2020-0878"}],"vendor":"Microsoft","product":"Edge and Internet Explorer","ransomware":true,"ransomwareUse":"Known","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2021-11-03T00:00:00.000Z","dueDate":"2022-05-03T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft Edge and Internet Explorer Memory Corruption Vulnerability","description":"Microsoft Edge and Internet Explorer contain a memory corruption vulnerability that allows attackers to execute code in the context of the current user.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2020-0878","label":"nvd.nist.gov/vuln/detail/CVE-2020-0878"}],"vendor":"Microsoft","product":"Edge and Internet Explorer","ransomware":true,"ransomwareUse":"Known","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"known","sources":["cisa"]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-787","name":"Out-of-bounds Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"microsoft","product":"chakracore","name":"chakracore","label":"chakracore","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< publication","noFixRecorded":false,"fixedIn":null},{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"< publication | na","eol":null,"hubHref":"/vendor/microsoft/chakracore"},{"vendor":"microsoft","product":"edge","name":"Edge","label":"edge","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/microsoft/edge"},{"vendor":"microsoft","product":"internet_explorer","name":"Internet Explorer","label":"internet_explorer","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"11","noFixRecorded":false,"fixedIn":null},{"text":"9","noFixRecorded":false,"fixedIn":null}],"versionsText":"11 | 9","eol":{"isEol":true,"eolDate":"2022-06-14T00:00:00.000Z","matchMethod":"name_exact","cycle":{"name":"11","label":"11","eolFrom":"2022-06-14T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":null},"product":{"name":"internet-explorer","label":"Internet Explorer","category":"app"}},"hubHref":"/vendor/microsoft/internet_explorer"},{"vendor":"microsoft","product":"internet explorer 11","name":"Internet Explorer 11","label":"internet explorer 11","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/internet_explorer_11"},{"vendor":"microsoft","product":"internet explorer 9","name":"Internet Explorer 9","label":"internet explorer 9","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/internet_explorer_9"},{"vendor":"microsoft","product":"microsoft edge (edgehtml-based)","name":"Microsoft Edge (EdgeHTML-based)","label":"microsoft edge (edgehtml-based)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0..0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0..0, < publication","eol":null,"hubHref":"/vendor/microsoft/microsoft_edge_edgehtml-based"}],"affectedCount":6,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0878","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0878","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0878","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0878","hostname":"www.cisa.gov","tags":["Government Resource","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-09-11T17:08:26.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2021-11-03T00:00:00.000Z","label":"Added to CISA KEV","detail":"Microsoft Edge and Internet Explorer Memory Corruption Vulnerability","source":"cisa"},{"kind":"kev-due","date":"2022-05-03T00:00:00.000Z","label":"CISA remediation due","detail":"Apply updates per vendor instructions.","source":"cisa"},{"kind":"modified","date":"2025-10-21T23:35:36.572Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":90,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T17:19:50.243Z","stale":false,"partial":false}}