{"schemaVersion":3,"id":"USN-4432-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"grub2, grub2-signed vulnerabilities\n\nJesse Michael and Mickey Shkatov discovered that the configuration parser\nin GRUB2 did not properly exit when errors were discovered, resulting in\nheap-based buffer overflows. A local attacker could use this to execute\narbitrary code and bypass UEFI Secure Boot restrictions. (CVE-2020-10713)\n\nChris Coulson discovered that the GRUB2 function handling code did not\nproperly handle a function being redefined, leading to a use-after-free\nvulnerability. A local attacker could use this to execute arbitrary code\nand bypass UEFI Secure Boot restrictions. (CVE-2020-15706)\n\nChris Coulson discovered that multiple integer overflows existed in GRUB2\nwhen handling certain filesystems or font files, leading to heap-based\nbuffer overflows. A local attacker could use these to execute arbitrary\ncode and bypass UEFI Secure Boot restrictions. (CVE-2020-14309,\nCVE-2020-14310, CVE-2020-14311)\n\nIt was discovered that the memory allocator for GRUB2 did not validate\nallocation size, resulting in multiple integer overflows and heap-based\nbuffer overflows when handling certain filesystems, PNG images or disk\nmetadata. A local attacker could use this to execute arbitrary code and\nbypass UEFI Secure Boot restrictions. (CVE-2020-14308)\n\nMathieu Trudel-Lapierre discovered that in certain situations, GRUB2\nfailed to validate kernel signatures. A local attacker could use this\nto bypass Secure Boot restrictions. (CVE-2020-15705)\n\nColin Watson and Chris Coulson discovered that an integer overflow\nexisted in GRUB2 when handling the initrd command, leading to a heap-based\nbuffer overflow. A local attacker could use this to execute arbitrary code\nand bypass UEFI Secure Boot restrictions. (CVE-2020-15707)","dates":{"published":"2020-07-29T18:50:12.000Z","modified":"2026-06-29T13:48:02.940Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"grub2","name":"grub2","label":"grub2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/grub2","purlType":"deb","versions":[{"text":"< 2.02~beta2-9ubuntu1.20","noFixRecorded":false,"fixedIn":null},{"text":"< 2.02~beta2-36ubuntu3.26","noFixRecorded":false,"fixedIn":null},{"text":"< 2.02-2ubuntu8.16","noFixRecorded":false,"fixedIn":null},{"text":"< 2.04-1ubuntu26.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.02~beta2-9ubuntu1.20 | < 2.02~beta2-36ubuntu3.26 | < 2.02-2ubuntu8.16 | < 2.04-1ubuntu26.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"grub2-signed","name":"grub2-signed","label":"grub2-signed","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/grub2-signed","purlType":"deb","versions":[{"text":"< 1.34.22","noFixRecorded":false,"fixedIn":null},{"text":"< 1.66.26","noFixRecorded":false,"fixedIn":null},{"text":"< 1.93.18","noFixRecorded":false,"fixedIn":null},{"text":"< 1.142.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.34.22 | < 1.66.26 | < 1.93.18 | < 1.142.3","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-4432-1","label":"ubuntu.com/security/notices/USN-4432-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-10713","label":"ubuntu.com/security/CVE-2020-10713","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-14308","label":"ubuntu.com/security/CVE-2020-14308","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-14309","label":"ubuntu.com/security/CVE-2020-14309","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-14310","label":"ubuntu.com/security/CVE-2020-14310","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-14311","label":"ubuntu.com/security/CVE-2020-14311","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-15705","label":"ubuntu.com/security/CVE-2020-15705","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-15706","label":"ubuntu.com/security/CVE-2020-15706","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2020-15707","label":"ubuntu.com/security/CVE-2020-15707","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-10713","CVE-2020-14308","CVE-2020-14309","CVE-2020-14310","CVE-2020-14311","CVE-2020-15705","CVE-2020-15706","CVE-2020-15707"],"downstream":[],"duplicates":[],"related":["CVE-2020-10713","CVE-2020-14308","CVE-2020-14309","CVE-2020-14310","CVE-2020-14311","CVE-2020-15705","CVE-2020-15706","CVE-2020-15707"]},"timeline":[{"kind":"published","date":"2020-07-29T18:50:12.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-29T13:48:02.940Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:07:28.666Z","stale":false,"partial":false}}