CVE Explorer
CVE-2026-20104
A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to an affected device to execute arbitrary code at boot time and break the chain of trust.
This vulnerability is due t
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"Cisco IOS XE Software","vendor":"Cisco","versions":[{"status":"affected","version":"16.12.8"},{"status":"affected","version":"16.12.6"},{"status":"affected","version":"16.12.6a"},{"status":"affected","version":"16.12.7"},{"status":"affected","version":"17.3.3"},{"status":"affected","version":"17.3.4"},{"status":"affected","version":"17.3.5"},{"status":"affected","version":"17.3.6"},{"status":"affected","version":"17.3.4b"},{"status":"affected","version":"17.3.7"},{"status":"affected","version":"17.3.8"},{"status":"affected","version":"17.3.8a"},{"status":"affected","version":"17.4.…
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:4446ec2dcf132d261c59e5610f22d677046f3f3ecd6c49037bdf119ca4f80b5c · sha256:14086e8051605287… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"PHYSICAL","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:4446ec2dcf132d261c59e5610f22d677046f3f3ecd6c49037bdf119ca4f80b5c · sha256:14086e8051605287… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-124","description":"Buffer Underwrite ('Buffer Underflow')","lang":"en","type":"cwe"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:4446ec2dcf132d261c59e5610f22d677046f3f3ecd6c49037bdf119ca4f80b5c · sha256:14086e8051605287… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"cisco-sa-xe-secureboot-bypass-B6uYxYSZ","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-secureboot-bypass-B6uYxYSZ"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:4446ec2dcf132d261c59e5610f22d677046f3f3ecd6c49037bdf119ca4f80b5c · sha256:14086e8051605287… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.