{"cve":"CVE-2021-27793","nvd":{"published":"2021-08-12T15:15:07.817","modified":"2026-06-17T03:45:27.930","status":"Modified","description":"ntermittent authorization failure in aaa tacacs+ with Brocade Fabric OS versions before Brocade Fabric OS v9.0.1b and after 9.0.0, also in Brocade Fabric OS before Brocade Fabric OS v8.2.3a and after v8.2.0 could cause a user with a valid account to be unable to log into the switch.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3},"cwes":["CWE-863"],"references":["https://security.netapp.com/advisory/ntap-20210819-0001/","https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1553","https://security.netapp.com/advisory/ntap-20210819-0001/","https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2021-1553"],"products":["broadcom:fabric_operating_system"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-27793","score":0.00905,"percentile":0.59827,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}