How severe is CVE-2021-21881?

CVE-2021-21881 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21881 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 37% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21881?

CVE-2021-21881 affects Lantronix Premierwave 2050 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21881?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-21881 published?

CVE-2021-21881 was published on 2021-12-22 and last updated on 2026-06-17.

CVE-2021-21881

CVE-2021-21881 is a critical-severity vulnerability in Lantronix Premierwave 2050 Firmware with a CVSS 3.x base score of 9.9. Its EPSS exploit-prediction score of 37% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
CVSS v2: 9.0
EPSS exploit prediction: 37% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Lantronix Premierwave 2050 Firmware
Published: 2021-12-22
Last modified: 2026-06-17

Description

An OS command injection vulnerability exists in the Web Manager Wireless Network Scanner functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-crafted HTTP request can lead to command execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Frequently asked questions

What is CVE-2021-21881?: An OS command injection vulnerability exists in the Web Manager Wireless Network Scanner functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-crafted HTTP request can lead to command execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.
How severe is CVE-2021-21881?: CVE-2021-21881 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21881 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 37% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21881?: CVE-2021-21881 affects Lantronix Premierwave 2050 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21881?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-21881 published?: CVE-2021-21881 was published on 2021-12-22 and last updated on 2026-06-17.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1325

Affected products (1)

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

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CVE-2021-21883 — Critical (CVSS 9.9): An OS command injection vulnerability exists in the Web Manager Diagnostics: Ping functionality of Lantronix…
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CVE-2021-21891 — Critical (CVSS 9.1): A stack-based buffer overflow vulnerability exists in the Web Manager FsBrowseClean functionality of Lantronix…

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