{"cve":"CVE-2021-27877","nvd":{"published":"2021-03-01T22:15:14.460","modified":"2026-06-17T03:45:32.920","status":"Analyzed","description":"An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html","https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1","http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html","https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27877"],"products":["veritas:backup_exec"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-27877","score":0.6491,"percentile":0.99247,"date":"2026-10-31"},"kev":{"cve":"CVE-2021-27877","date_added":"2023-04-07","due_date":"2023-04-28","vendor":"Veritas","product":"Backup Exec Agent","known_ransomware":true},"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."]}