{"id":"CVE-2010-0249","kind":"vulnerability","aliases":["CVE-2010-0249"],"related":[],"title":"Use-after-free vulnerability in Microsoft Internet Explorer 6, 6 SP1, 7, and 8 on Windows 2000 SP4; Windows XP SP2…","description":"Use-after-free vulnerability in Microsoft Internet Explorer 6, 6 SP1, 7, and 8 on Windows 2000 SP4; Windows XP SP2 and SP3; Windows Server 2003 SP2; Windows Vista Gold, SP1, and SP2; Windows Server 2008 Gold, SP2, and R2; and Windows 7 allows remote attackers to execute arbitrary code by accessing a pointer associated with a deleted object, related to incorrectly initialized memory and improper handling of objects in memory, as exploited in the wild in December 2009 and January 2010 during Operation Aurora, aka \"HTML Object Memory Corruption Vulnerability.\"","summary":"Microsoft Internet Explorer has a use-after-free bug where it keeps using a pointer to an object it already deleted. A remote attacker who gets a user to load a malicious page can run arbitrary code on the victim's machine.","severity":"critical","cvss":9.3,"epss":null,"exploited":true,"exploited_at":"2026-05-20T00:00:00+00:00","products":[{"name":"Microsoft Internet Explorer","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 5.0.1","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 6","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 7.0","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 8","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browsing-users","exploited","internet-explorer","other","windows"],"not_affected_if":["internet-explorer-patched","no-internet-explorer-installed"],"how_to_check":"Check whether any machine still runs Internet Explorer with a version affected by CVE-2010-0249 (the sources do not list exact versions).","fix":"Remove Internet Explorer or move to a supported browser; the sources say to discontinue use of the product if vendor mitigations are unavailable.\nApply the vendor mitigations per Microsoft's instructions if the product must stay in use (exact patch IDs unknown).","status":"open","published_at":"2010-01-15T17:30:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:34:08+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-23T20:34:08Z","model":"claude-haiku-5-5","output":{"fix":"Remove Internet Explorer or move to a supported browser; the sources say to discontinue use of the product if vendor mitigations are unavailable.\nApply the vendor mitigations per Microsoft's instructions if the product must stay in use (exact patch IDs unknown).","summary":"Microsoft Internet Explorer has a use-after-free bug where it keeps using a pointer to an object it already deleted. A remote attacker who gets a user to load a malicious page can run arbitrary code on the victim's machine.","category":"other","who_cares":["windows","internet-explorer","browsing-users"],"confidence":0.6,"analyst_note":"Get the affected and fixed IE versions and Microsoft's advisory ID from the MS10-002 bulletin or NVD entry for CVE-2010-0249; the sources here give no version data.","how_to_check":"Check whether any machine still runs Internet Explorer with a version affected by CVE-2010-0249 (the sources do not list exact versions).\nunknown","needs_analyst":true,"not_affected_if":["no-internet-explorer-installed","internet-explorer-patched"],"severity_if_unknown":"high"},"cost_usd":0.000411,"input_tokens":2122,"output_tokens":397,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-0249':25A,28A '-2010':24A,27A '2000':18A,113C '2003':122C '2008':132C '2009':175C '2010':178C '6':10A,11A,105C,106C '7':13A,108C,139C '8':15A,110C 'access':148C 'aka':182C 'allow':140C 'alreadi':73B 'arbitrari':89B,145C 'associ':151C 'attack':77B,142C 'aurora':181C 'brows':45B 'browsing-us':44B 'bug':62B 'code':90B,146C 'corrupt':186C 'cve':23A,26A 'decemb':174C 'delet':74B,154C 'execut':144C 'exploit':47B,169C 'explor':9A,50B,55B,104C 'explorer':31A,34A,37A,40A,43A 'free':4A,61B,99C 'get':79B 'gold':126C,133C 'handl':163C 'html':183C 'improp':162C 'incorrect':158C 'initi':159C 'internet':8A,30A,33A,36A,39A,42A,49B,54B,103C 'internet-explor':48B 'januari':177C 'keep':65B 'load':83B 'machin':95B 'malici':85B 'memori':160C,167C,185C 'microsoft':7A,29A,32A,35A,38A,41A,53B,102C 'object':71B,155C,165C,184C 'oper':180C 'page':86B 'pointer':68B,150C 'r2':136C 'relat':156C 'remot':76B,141C 'run':88B 'server':121C,131C 'sp1':12A,107C,127C 'sp2':22A,117C,123C,129C,134C 'sp3':119C 'sp4':19A,114C 'use':2A,59B,66B,97C 'use-after-fre':1A,58B,96C 'user':46B,81B 'victim':93B 'vista':125C 'vulner':5A,100C,187C 'wild':172C 'window':17A,20A,52B,112C,115C,120C,124C,130C,138C 'xp':21A,116C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2010-01-15T17:30:00+00:00","kev":{"dateAdded":"2026-05-20","dueDate":"2026-06-03","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2010-0249","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2010-0249","severity":null,"published_at":"2026-05-20T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T19:35:19+00:00","note":null},{"source":"nvd","external_id":"CVE-2010-0249","url":"https://nvd.nist.gov/vuln/detail/CVE-2010-0249","severity":null,"published_at":"2010-01-15T17:30:00+00:00","modified_at":"2026-06-16T23:15:47+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}