CVE-2021-39509

high-risk
Published 2021-08-24

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.

Do I need to act?

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18.0% chance of exploitation in next 30 days
EPSS score — higher than 82% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Dlink

References (6)

Third Party Advisory https://github.com/doudoudedi/main-DIR-816_A2_Command-injection
Exploit https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/inject...
Vendor Advisory https://www.dlink.com/en/security-bulletin/
Third Party Advisory https://github.com/doudoudedi/main-DIR-816_A2_Command-injection
Exploit https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/inject...
Vendor Advisory https://www.dlink.com/en/security-bulletin/
50
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 13/34 · Low
Exposure 5/34 · Minimal