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Vulnerability record · CVE-2021-21892 · published 22 December 2021

CVE-2021-21892: Lantronix premierwave 2050 firmware stack-based buffer overflow vulnerability

Lantronix · Premierwave 2050 Firmware

A stack-based buffer overflow vulnerability exists in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

9.9 CVSS 3.1 Critical EPSS 30% · top 1.8% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
9.9CVSS 3.1 base score, v2 6.5
30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A stack-based buffer overflow vulnerability exists in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1335 ExploitThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1335 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2021-21881Lantronix premierwave 2050 firmware os command injection vulnerabilityAn OS command injection vulnerability exists in the Web Manager Wireless Network Scanner functionality of Lantronix PremierWave 2050 8.9.0.0R4. A spe…EPSS 36%9.9CVE-2021-21883Lantronix premierwave 2050 firmware os command injection vulnerabilityAn OS command injection vulnerability exists in the Web Manager Diagnostics: Ping functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-…EPSS 6.1%9.9CVE-2021-21889Lantronix premierwave 2050 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability exists in the Web Manager Ping functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A special…EPSS 2.8%9.9CVE-2021-21872Lantronix premierwave 2050 firmware os command injection vulnerabilityAn OS command injection vulnerability exists in the Web Manager Diagnostics: Traceroute functionality of Lantronix PremierWave 2050 8.9.0.0R4. A spec…EPSS 6.1%9.1CVE-2021-21884Lantronix premierwave 2050 firmware os command injection vulnerabilityAn OS command injection vulnerability exists in the Web Manager SslGenerateCSR functionality of Lantronix PremierWave 2050 8.9.0.0R4. A specially-cra…EPSS 5.3%9.1CVE-2021-21887Lantronix premierwave 2050 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability exists in the Web Manager SslGenerateCSR functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU).…EPSS 3.0%9.1CVE-2021-21888Lantronix premierwave 2050 firmware os command injection vulnerabilityAn OS command injection vulnerability exists in the Web Manager SslGenerateCertificate functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU…EPSS 3.9%9.1CVE-2021-21890Lantronix premierwave 2050 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability exists in the Web Manager FsBrowseClean functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). …EPSS 3.0%

Source: NIST National Vulnerability Database (record CVE-2021-21892), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.