CVE-2021-27877 is a critical vulnerability affecting Veritas Backup Exec versions prior to 21.2, stemming from an unpatched, legacy SHA authentication scheme that allows remote attackers to gain unauthorized access and execute privileged commands on an Agent. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network without authentication or user interaction, leading to complete compromise of confidentiality, integrity, and availability. It is actively exploited in the wild, notably by the ALPHV (BlackCat) ransomware group, with public exploit modules available in Metasploit and Nuclei, and has garnered significant community and media attention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 21.2CPE matchmatch criteria | cpe:2.3:a:veritas:backup_exec:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.