CVE-2021-39510
9.8
CRITICAL · CVSS 3.1 · EPSS 8.6% (pctl 95)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 8.62% — more likely to be exploited than 95% of all CVEs |
| Weakness | CWE-77 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-08-24 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| dlink | dir-816 |
| dlink | dir-816 firmware |
References
- https://github.com/doudoudedi/main-DIR-816_A1_Command-injection
- https://github.com/doudoudedi/main-DIR-816_A1_Command-injection/blob/main/injection_A1.md
- https://www.dlink.com/en/security-bulletin/
- https://github.com/doudoudedi/main-DIR-816_A1_Command-injection
- https://github.com/doudoudedi/main-DIR-816_A1_Command-injection/blob/main/injection_A1.md
- https://www.dlink.com/en/security-bulletin/
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