CVE-2021-21879

Name: CVE-2021-21879
Creator: NVD / NIST
Published: 2021-12-22T19:15:08.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.66%

Last modified Jun 17, 2026

CVE-2021-21879 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 3.66% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.66%

88.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Lantronix	Premierwave 2050	8.9.0.0	R4

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1323Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1323Exploit, Third Party Advisory

Timeline

Published: Dec 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21879?

How severe is CVE-2021-21879?

CVE-2021-21879 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21879?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21879?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST