Is CVE-2021-21879 actively exploited?

No active exploitation of CVE-2021-21879 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21879 be exploited remotely?

Yes. CVE-2021-21879 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21879?

CVE-2021-21879 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-21879

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

8.8

CVSS v3.1

Official Description

A directory traversal vulnerability exists in the Web Manager File Upload functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-crafted HTTP request can lead to arbitrary file overwrite. An attacker can make an authenticated HTTP request to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2021-21879 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low 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 8.8.