What is CVE-2021-21875?

CVE-2021-21875 is a critical-severity vulnerability in Lantronix Premierwave 2050, classified under OS Command Injection. CVSS score: 9.1/10. Published 2021-12-22.

How severe is CVE-2021-21875?

Critical severity. CVSS v3 base score is 9.1 out of 10.

RCE in Lantronix Premierwave 2050

CVE-2021-21875

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

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Lantronix Premierwave 2050
Lantronix Premierwave 2050 Firmware — versions 8.9.0.0
Lantronix — versions Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU)

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1314 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21875?: CVE-2021-21875 is a critical-severity vulnerability in Lantronix Premierwave 2050, classified under OS Command Injection. CVSS score: 9.1/10. Published 2021-12-22.
How severe is CVE-2021-21875?: Critical severity. CVSS v3 base score is 9.1 out of 10.