Cyber Resilience

CVE-2021-39509

CriticalPublic PoCRCE

Published: 24 August 2021

Published
24 August 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.1801 95.3th percentile
Risk Priority 30 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-39509 is a critical-severity Command Injection (CWE-77) vulnerability in Dlink Dir-816 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 4.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

An issue was discovered in D-Link DIR-816 DIR-816A2_FWv1.10CNB05_R1B011D88210 The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through…

more

shell metacharacters.

CWE(s)
CWE-77

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

dlink
dir-816 firmware
1.10cnb05_r1b011d88210

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References