CVE Tools
Sign in

CVE-2021-27877

Published: Mar 1, 2021Updated: Nov 3, 2025 Sources: CVE List NVD BDUNVD-CWE-noinfo
8.2HIGH
NVD MITRE
EPSS Score
64.9%
Top 0.9%
CISA KEV
Active Exploitation
Since Apr 7, 2023
Exploits
1 Known
Remediation
Patch Available
Self-Check
Nuclei · OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

NVD-CWE-noinfo

Affected Products

veritas
commercial·US
backup execSaaSSaaS Service
Cloud & SaaS / saas-application
Veritas Technologies LLC
commercial·USaka veritas, veritas tech
Backup ExecOn-prem
Enterprise Software / itsm-monitoring
and 1 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Apr 7, 2023
Remediation due:Apr 28, 2023
Ransomware:Known ransomware use

Required action: Apply updates per vendor instructions.

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Is your org exposed to CVE-2021-27877?We'll check your whole external perimeter for exposure — free. Check my exposure

References

http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html
packetstormsecurity.com
https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1
veritas.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27877
cisa.gov
and 3 more references View all →
News mentions
Could not load news mentions.

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-27877 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows