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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.051 (92.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.051 · newest: 0.051 · change: 0.000
Affected products
- Dlink Dir-816 — versions a2
- Dlink Dir-816 Firmware — versions 1.10cnb05_r1b011d88210
Weakness classification (CWE)
References
- www.dlink.com/en/security-bulletin/ (Vendor Advisory)
- github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.md (Exploit, Third Party Advisory)
- github.com/doudoudedi/main-DIR-816_A2_Command-injection (Third Party Advisory)
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.