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Vulnerability record · CVE-2021-21890 · published 22 December 2021

CVE-2021-21890: Lantronix premierwave 2050 firmware stack-based buffer overflow vulnerability

Lantronix · Premierwave 2050 Firmware

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

9.1 CVSS 3.1 Critical EPSS 3.0% · top 13.2% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
9.1CVSS 3.1 base score, v2 6.5
3.0%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 FsBrowseClean functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution in the vulnerable portion of the branch (deletedir). An attacker can make an authenticated HTTP request to trigger this vulnerability.

CVSS:3.1/AV:N/AC:L/PR:H/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-2021-1334 ExploitTechnical DescriptionThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1334 ExploitTechnical DescriptionThird 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-2021-21892Lantronix premierwave 2050 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability exists in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A sp…EPSS 30%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%

Source: NIST National Vulnerability Database (record CVE-2021-21890), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.