Is CVE-2021-20705 actively exploited?

No active exploitation of CVE-2021-20705 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20705 be exploited remotely?

Yes. CVE-2021-20705 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-20705?

CVE-2021-20705 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-20705

HIGH

CVE-2021-20705

CWE-20Published: November 3, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

Improper input validation vulnerability in the WebManager CLUSTERPRO X 4.3 for Windows and earlier, EXPRESSCLUSTER X 4.3 for Windows and earlier, CLUSTERPRO X 4.3 SingleServerSafe for Windows and earlier, EXPRESSCLUSTER X 4.3 SingleServerSafe for Windows and earlier allows attacker to remote file upload via network.

NVD Source

Technical Analysis

CVE-2021-20705 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 full integrity compromise (data manipulation), with a CVSS base score of 7.5.