CVE-2021-39510
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router via the HTTP...
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, 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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, 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.
- Record
CVE-2021-39510- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-77
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, 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.
- Record
CVE-2021-39510- Updated
- 2026-11-02
EUVDEUVD-2021-25867 No score
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, 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.
- Record
EUVD-2021-25867- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wf4j-v485-5m9f No score
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router via the HTTP...
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router via the HTTP request parameter in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function.
- Record
GHSA-wf4j-v485-5m9f- Weakness
- CWE-77
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-39510 is a critical vulnerability (CVSS 9.8) in Dlink Dir-816 Firmware, published August 24, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 8.62%, the 95th percentile. No source names a fixed version.