CVE-2021-21879

Premierwave 2050 vulnerability

CVSS

8.8

EPSS

3.7%

EPSS pct

88th

Exploited

No known

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.

Affected vendor

Lantronix

Affected product

Premierwave 2050

CVSS vector

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

Weakness type (CWE)

CWE-22 — Path Traversal

Published

2021-12-22

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-21879

Confirm whether Lantronix Premierwave 2050 is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-21879.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-21879

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-21879 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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