Security readout for executives and security teams
CVE-2021-27878 affects Veritas Backup Exec before 21.2. A flaw in the product’s authentication scheme can let an attacker get unauthorized access to an agent connection and run commands with system privileges. Because CISA lists it in KEV, treat exposed or outdated deployments as urgent. Organizations running Veritas Backup Exec versions before 21.2 are the likely exposure. Risk is highest where Backup Exec agents or related management paths are reachable from untrusted networks. The provided sources do not enumerate platforms, CPEs, or exact agent deployment variants. Immediate action is warranted for any organization using Veritas Backup Exec before 21.2. The issue enables system-level command execution and is in CISA’s Known Exploited Vulnerabilities catalog, making delayed remediation a material operational risk. Mitigation focus: Upgrade affected Backup Exec deployments to version 21.2 or later per Veritas guidance.; Review Veritas advisory VTS21-001 for product-specific remediation instructions.; Restrict network access to Backup Exec agent and management interfaces..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2021-27878 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.veritas.com/content/support/en_US/security/VTS21-001#issue3CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27878CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.