CVE-2021-3554: Improper Access Control vulnerability in the patchesUpdate API

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-24 · updated 2026-06-17
Weakness: CWE-284

Description

Improper Access Control vulnerability in the patchesUpdate API as implemented in Bitdefender Endpoint Security Tools for Linux as a relay role allows an attacker to manipulate the remote address used for pulling patches. This issue affects: Bitdefender Endpoint Security Tools for Linux versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.

Affected products

Bitdefender Endpoint Security Tools: before 6.6.27.390; from 7.0.0.00 before 7.1.2.33 — fixed in 6.6.27.390, 7.1.2.33
Bitdefender GravityZone: before 6.24.1-1; 6.24.1-1 — fixed in 6.24.1-1

How to fix

Upgrade to a fixed version: Bitdefender Endpoint Security Tools 6.6.27.390, 7.1.2.33; Bitdefender GravityZone 6.24.1-1. Check the vendor advisory for mitigations.

References

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