CVE-2021-27877
Veritas Backup Exec Agent Improper Authentication Vulnerability
- Published
- Mar 1, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- mitre
- Evidence observed
- Apr 7, 2023
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.2%
- Model date
- Oct 19, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
modules/exploits/multi/veritas/beagent_sha_auth_rce.rb
Metasploit Framework modulesDeclared conditions
- platform: Linux,Windows($.exploit_multi/veritas/beagent_sha_auth_rce.platform)
- verification: check_declared($.exploit_multi/veritas/beagent_sha_auth_rce.check)
javascript/cves/2021/CVE-2021-27877.yaml
Nuclei TemplatesDeclared conditions
- verification: dsl($.matchers[*].type)
Responsible use
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