What’s Vulnerable › Vulnerabilities

CVE-2021-21876

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-22 · updated 2026-06-17
• Weakness: CWE-78

Description

Specially-crafted HTTP requests can lead to arbitrary command execution in PUT requests. An attacker can make authenticated HTTP requests to trigger this vulnerability.

Affected products

• LANTRONIX Premierwave 2050 Firmware: 8.9.0.0-r4

References

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1315
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1315

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