Is CVE-2021-3554 actively exploited?

No active exploitation of CVE-2021-3554 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-3554 be exploited remotely?

Yes. CVE-2021-3554 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-3554?

CVE-2021-3554 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2021-3554

CWE-284Published: November 24, 2021· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-3554 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.