CVE-2021-39509
CRITICAL EXPLOITEDD-Link DIR-816 A2 Firmware 1.10CNB05_R1B011D88210 - OS Command Injection via form2userconfig.cgi Username Parameter
Title source: llmExploitation Summary
CVE-2021-39509 has been observed exploited in the wild (reported by VulnCheck KEV).
Description
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.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_misc
https://www.dlink.com/en/security-bulletin/
Exploit, Third Party Advisory x_refsource_misc
https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.md
Third Party Advisory x_refsource_misc
https://github.com/doudoudedi/main-DIR-816_A2_Command-injection
Scores
CVSS v3
9.8
EPSS
0.0510
EPSS Percentile
91.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
VulnCheck KEV
2024-10-09
CWE
CWE-77
Status
published
Products (1)
dlink/dir-816_firmware
1.10cnb05_r1b011d88210
Published
Aug 24, 2021
Tracked Since
Feb 18, 2026