CVE-2021-21892
CVSS v3
9.9
CRITICAL
EPSS Score
30.4 %
exploit probability, as of 2026-10-05
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-12-22
Frequently asked questions
What is CVE-2021-21892?
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.
Is CVE-2021-21892 actively exploited?
Active exploitation of CVE-2021-21892 has not been confirmed. Its EPSS score was 30.4% on 2026-10-05, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-21892?
CVE-2021-21892 has a CVSS v3 base score of 9.9 (CRITICAL severity).
Is CVE-2021-21892 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 50 free checks/month · Free API key
Other 2021 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).