CRITICAL

CVE-2021-21887

CVSS v3

9.1

CRITICAL

EPSS Score

3.1 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-21887 yet.

Full record on NVD

Description

A stack-based buffer overflow vulnerability exists in the Web Manager SslGenerateCSR functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Technical details

Published: 2021-12-22

Frequently asked questions

What is CVE-2021-21887?

Is CVE-2021-21887 actively exploited?

Active exploitation of CVE-2021-21887 has not been confirmed. Its EPSS score was 3.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-21887?

CVE-2021-21887 has a CVSS v3 base score of 9.1 (CRITICAL severity).

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