{"schemaVersion":3,"id":"CVE-2023-20236","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability in the iPXE boot function of Cisco IOS XR software could allow an authenticated, local attacker to install an unverified software image on an affected device.\n\n This vulnerability is due to insufficient image verification. An attacker could exploit this vulnerability by manipulating the boot parameters for image verification during the iPXE boot process on an affected device. A successful exploit could allow the attacker to boot an unverified software image on the affected device.","dates":{"published":"2023-09-13T16:39:19.418Z","modified":"2025-12-16T18:23:20.640Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.001,"percentile":0.00813,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.001},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.001,"percentile":0.00813}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.001,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.001,"percentile":0.00813}]},"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":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature","description":"The product does not verify, or incorrectly verifies, the cryptographic signature for data.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/347.html"},{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity","description":"The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/345.html"}],"affected":[{"vendor":"cisco","product":"cisco ios xr software","name":"Cisco IOS XR Software","label":"cisco ios xr software","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"5.2.0","noFixRecorded":false,"fixedIn":null},{"text":"5.2.1","noFixRecorded":false,"fixedIn":null},{"text":"5.2.2","noFixRecorded":false,"fixedIn":null},{"text":"5.2.4","noFixRecorded":false,"fixedIn":null},{"text":"5.2.3","noFixRecorded":false,"fixedIn":null},{"text":"5.2.5","noFixRecorded":false,"fixedIn":null},{"text":"5.2.47","noFixRecorded":false,"fixedIn":null},{"text":"5.3.0","noFixRecorded":false,"fixedIn":null},{"text":"5.3.1","noFixRecorded":false,"fixedIn":null},{"text":"5.3.2","noFixRecorded":false,"fixedIn":null},{"text":"5.3.3","noFixRecorded":false,"fixedIn":null},{"text":"5.3.4","noFixRecorded":false,"fixedIn":null},{"text":"6.0.0","noFixRecorded":false,"fixedIn":null},{"text":"6.0.1","noFixRecorded":false,"fixedIn":null},{"text":"6.0.2","noFixRecorded":false,"fixedIn":null},{"text":"6.1.1","noFixRecorded":false,"fixedIn":null},{"text":"6.1.2","noFixRecorded":false,"fixedIn":null},{"text":"6.1.3","noFixRecorded":false,"fixedIn":null},{"text":"6.1.4","noFixRecorded":false,"fixedIn":null},{"text":"6.1.12","noFixRecorded":false,"fixedIn":null},{"text":"6.1.22","noFixRecorded":false,"fixedIn":null},{"text":"6.1.32","noFixRecorded":false,"fixedIn":null},{"text":"6.1.36","noFixRecorded":false,"fixedIn":null},{"text":"6.1.42","noFixRecorded":false,"fixedIn":null},{"text":"6.2.1","noFixRecorded":false,"fixedIn":null},{"text":"6.2.2","noFixRecorded":false,"fixedIn":null},{"text":"6.2.3","noFixRecorded":false,"fixedIn":null},{"text":"6.2.25","noFixRecorded":false,"fixedIn":null},{"text":"6.2.11","noFixRecorded":false,"fixedIn":null},{"text":"6.3.2","noFixRecorded":false,"fixedIn":null},{"text":"6.3.3","noFixRecorded":false,"fixedIn":null},{"text":"6.3.15","noFixRecorded":false,"fixedIn":null},{"text":"6.4.1","noFixRecorded":false,"fixedIn":null},{"text":"6.4.2","noFixRecorded":false,"fixedIn":null},{"text":"6.4.3","noFixRecorded":false,"fixedIn":null},{"text":"6.5.1","noFixRecorded":false,"fixedIn":null},{"text":"6.5.2","noFixRecorded":false,"fixedIn":null},{"text":"6.5.3","noFixRecorded":false,"fixedIn":null},{"text":"6.5.25","noFixRecorded":false,"fixedIn":null},{"text":"6.5.26","noFixRecorded":false,"fixedIn":null},{"text":"6.5.28","noFixRecorded":false,"fixedIn":null},{"text":"6.5.29","noFixRecorded":false,"fixedIn":null},{"text":"6.5.32","noFixRecorded":false,"fixedIn":null},{"text":"6.5.33","noFixRecorded":false,"fixedIn":null},{"text":"6.6.2","noFixRecorded":false,"fixedIn":null},{"text":"6.6.3","noFixRecorded":false,"fixedIn":null},{"text":"6.6.25","noFixRecorded":false,"fixedIn":null},{"text":"6.6.4","noFixRecorded":false,"fixedIn":null},{"text":"7.0.1","noFixRecorded":false,"fixedIn":null},{"text":"7.0.2","noFixRecorded":false,"fixedIn":null},{"text":"7.0.12","noFixRecorded":false,"fixedIn":null},{"text":"7.0.14","noFixRecorded":false,"fixedIn":null},{"text":"7.1.1","noFixRecorded":false,"fixedIn":null},{"text":"7.1.15","noFixRecorded":false,"fixedIn":null},{"text":"7.1.2","noFixRecorded":false,"fixedIn":null},{"text":"7.1.3","noFixRecorded":false,"fixedIn":null},{"text":"6.7.1","noFixRecorded":false,"fixedIn":null},{"text":"6.7.2","noFixRecorded":false,"fixedIn":null},{"text":"6.7.3","noFixRecorded":false,"fixedIn":null},{"text":"6.7.4","noFixRecorded":false,"fixedIn":null},{"text":"7.2.0","noFixRecorded":false,"fixedIn":null},{"text":"7.2.1","noFixRecorded":false,"fixedIn":null},{"text":"7.2.2","noFixRecorded":false,"fixedIn":null},{"text":"7.3.1","noFixRecorded":false,"fixedIn":null},{"text":"7.3.15","noFixRecorded":false,"fixedIn":null},{"text":"7.3.2","noFixRecorded":false,"fixedIn":null},{"text":"7.3.3","noFixRecorded":false,"fixedIn":null},{"text":"7.3.5","noFixRecorded":false,"fixedIn":null},{"text":"7.4.1","noFixRecorded":false,"fixedIn":null},{"text":"7.4.2","noFixRecorded":false,"fixedIn":null},{"text":"6.8.1","noFixRecorded":false,"fixedIn":null},{"text":"6.8.2","noFixRecorded":false,"fixedIn":null},{"text":"7.5.1","noFixRecorded":false,"fixedIn":null},{"text":"7.5.3","noFixRecorded":false,"fixedIn":null},{"text":"7.5.2","noFixRecorded":false,"fixedIn":null},{"text":"7.5.4","noFixRecorded":false,"fixedIn":null},{"text":"7.6.1","noFixRecorded":false,"fixedIn":null},{"text":"7.6.2","noFixRecorded":false,"fixedIn":null},{"text":"7.7.1","noFixRecorded":false,"fixedIn":null},{"text":"7.7.2","noFixRecorded":false,"fixedIn":null},{"text":"7.7.21","noFixRecorded":false,"fixedIn":null},{"text":"6.9.1","noFixRecorded":false,"fixedIn":null},{"text":"6.9.2","noFixRecorded":false,"fixedIn":null},{"text":"7.8.1","noFixRecorded":false,"fixedIn":null},{"text":"7.8.2","noFixRecorded":false,"fixedIn":null},{"text":"7.9.1","noFixRecorded":false,"fixedIn":null},{"text":"7.9.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"5.2.0 | 5.2.1 | 5.2.2 | 5.2.4 | 5.2.3 | 5.2.5 | 5.2.47 | 5.3.0 | 5.3.1 | 5.3.2 | 5.3.3 | 5.3.4 | 6.0.0 | 6.0.1 | 6.0.2 | 6.1.1 | 6.1.2 | 6.1.3 | 6.1.4 | 6.1.12 | 6.1.22 | 6.1.32 | 6.1.36 | 6.1.42 | 6.2.1 | 6.2.2 | 6.2.3 | 6.2.25 | 6.2.11 | 6.3.2 | 6.3.3 | 6.3.15 | 6.4.1 | 6.4.2 | 6.4.3 | 6.5.1 | 6.5.2 | 6.5.3 | 6.5.25 | 6.5.26 | 6.5.28 | 6.5.29 | 6.5.32 | 6.5.33 | 6.6.2 | 6.6.3 | 6.6.25 | 6.6.4 | 7.0.1 | 7.0.2 | 7.0.12 | 7.0.14 | 7.1.1 | 7.1.15 | 7.1.2 | 7.1.3 | 6.7.1 | 6.7.2 | 6.7.3 | 6.7.4 | 7.2.0 | 7.2.1 | 7.2.2 | 7.3.1 | 7.3.15 | 7.3.2 | 7.3.3 | 7.3.5 | 7.4.1 | 7.4.2 | 6.8.1 | 6.8.2 | 7.5.1 | 7.5.3 | 7.5.2 | 7.5.4 | 7.6.1 | 7.6.2 | 7.7.1 | 7.7.2 | 7.7.21 | 6.9.1 | 6.9.2 | 7.8.1 | 7.8.2 | 7.9.1 | 7.9.2","eol":null,"hubHref":"/vendor/cisco/cisco_ios_xr_software"},{"vendor":"cisco","product":"ios_xr","name":"ios xr","label":"ios_xr","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 7.10.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 7.10.1","eol":null,"hubHref":"/vendor/cisco/ios_xr"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-ipxe-sigbypass-pymfyqgB","label":"sec.cloudapps.cisco.com/security/…","hostname":"sec.cloudapps.cisco.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2023-09-13T16:39:19.418Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2025-12-16T18:23:20.640Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":31,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T16:39:04.851Z","stale":false,"partial":false}}