What is CVE-2021-39509?

CVE-2021-39509 is a critical-severity vulnerability in Dlink Dir-816, classified under Command Injection. CVSS score: 9.8/10. Published 2021-08-24.

How severe is CVE-2021-39509?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Dlink Dir-816

CVE-2021-39509

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 shell metacharacters.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.051 (91.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Dlink Dir-816 — versions a2
Dlink Dir-816_firmware — versions 1.10cnb05_r1b011d88210
N/a — versions n/a

Weakness classification (CWE)

CWE-77 — Command Injection

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-39509?: CVE-2021-39509 is a critical-severity vulnerability in Dlink Dir-816, classified under Command Injection. CVSS score: 9.8/10. Published 2021-08-24.
How severe is CVE-2021-39509?: Critical severity. CVSS v3 base score is 9.8 out of 10.