Is CVE-2021-21507 actively exploited?

No active exploitation of CVE-2021-21507 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21507 be exploited remotely?

Yes. CVE-2021-21507 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21507?

CVE-2021-21507 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-21507

CWE-261Published: April 30, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Dell EMC Networking X-Series firmware versions prior to 3.0.1.8 and Dell EMC PowerEdge VRTX Switch Module firmware versions prior to 2.0.0.82 contain a Weak Password Encryption Vulnerability. A remote unauthenticated attacker could potentially exploit this vulnerability, leading to the disclosure of certain user credentials. The attacker may be able to use the exposed credentials to access the vulnerable system with privileges of the compromised account.

NVD Source

Technical Analysis

CVE-2021-21507 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 9.8.