CVE-2021-27876 is a critical authentication bypass vulnerability affecting Veritas Backup Exec versions prior to 21.2. Attackers can exploit a flaw in the SHA Authentication scheme to gain unauthorized access to the agent, allowing them to execute data management commands with System privileges and access arbitrary files. This vulnerability carries a high CVSS score of 8.1, indicating a low-complexity network attack that can lead to high confidentiality and integrity impacts. Its FAUCET Risk Score of 99/100 further emphasizes its severe nature. The vulnerability is actively exploited, notably by the ALPHV (BlackCat) ransomware group, and is listed in CISA's KEV catalog. A Metasploit module exists for remote code execution, and it has garnered significant community discussion and media coverage due to its use in ransomware campaigns.
| 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:L/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.