Is CVE-2021-21873 actively exploited?

No active exploitation of CVE-2021-21873 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21873 be exploited remotely?

Yes. CVE-2021-21873 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21873?

CVE-2021-21873 has a CVSS score of 9.1 (CRITICAL).

HOME VULNERABILITIESCVE-2021-21873

CRITICAL

CVE-2021-21873

CWE-78Published: December 22, 2021· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

A specially-crafted HTTP request can lead to arbitrary command execution in RSA keypasswd parameter. An attacker can make an authenticated HTTP request to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2021-21873 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 9.1.

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.