How severe is CVE-2021-21878?

CVE-2021-21878 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-21878 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21878?

CVE-2021-21878 affects Lantronix Premierwave 2050 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21878?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21878 published?

CVE-2021-21878 was published on 2021-12-22 and last updated on 2026-06-17.

CVE-2021-21878

CVE-2021-21878 is a medium-severity vulnerability in Lantronix Premierwave 2050 Firmware with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-668.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
CVSS v2: 6.8
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-668
Affected product: Lantronix Premierwave 2050 Firmware
Published: 2021-12-22
Last modified: 2026-06-17

Description

A local file inclusion vulnerability exists in the Web Manager Applications and FsBrowse functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-crafted series of HTTP requests can lead to local file inclusion. An attacker can make a series of authenticated HTTP requests to trigger this vulnerability.

Frequently asked questions

What is CVE-2021-21878?: A local file inclusion vulnerability exists in the Web Manager Applications and FsBrowse functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-crafted series of HTTP requests can lead to local file inclusion. An attacker can make a series of authenticated HTTP requests to trigger this vulnerability.
How severe is CVE-2021-21878?: CVE-2021-21878 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-21878 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21878?: CVE-2021-21878 affects Lantronix Premierwave 2050 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21878?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21878 published?: CVE-2021-21878 was published on 2021-12-22 and last updated on 2026-06-17.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1322

Affected products (1)

cpe:2.3:o:lantronix:premierwave_2050_firmware:8.9.0.0:r4:*:*:*:*:*:*

More vulnerabilities in Lantronix Premierwave 2050 Firmware

CVE-2021-21892 — Critical (CVSS 9.9): A stack-based buffer overflow vulnerability exists in the Web Manager FsUnmount functionality of Lantronix PremierWave…
CVE-2021-21889 — Critical (CVSS 9.9): A stack-based buffer overflow vulnerability exists in the Web Manager Ping functionality of Lantronix PremierWave 2050…
CVE-2021-21883 — Critical (CVSS 9.9): An OS command injection vulnerability exists in the Web Manager Diagnostics: Ping functionality of Lantronix…
CVE-2021-21881 — Critical (CVSS 9.9): An OS command injection vulnerability exists in the Web Manager Wireless Network Scanner functionality of Lantronix…
CVE-2021-21872 — Critical (CVSS 9.9): An OS command injection vulnerability exists in the Web Manager Diagnostics: Traceroute functionality of Lantronix…
CVE-2021-21894 — Critical (CVSS 9.1): A directory traversal vulnerability exists in the Web Manager FsTFtp functionality of Lantronix PremierWave 2050…

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