What is CVE-2023-39637?

CVE-2023-39637 is a critical-severity vulnerability in Dlink Dir-816, classified under Command Injection. CVSS score: 9.8/10. Published 2023-09-12.

How severe is CVE-2023-39637?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Dlink Dir-816

CVE-2023-39637

D-Link DIR-816 A2 1.10 B05 was discovered to contain a command injection vulnerability via the component /goform/Diagnosis.

Vulnerability class: Command Injection (OS Command Injection)

Published 2023-09-12 · last modified 2026-07-09.

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: 0.021 (80.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.021 · change: +0.004

Affected products

Dlink Dir-816 — versions a2
Dlink Dir-816 Firmware — versions 1.10b05

Weakness classification (CWE)

CWE-77 — Command Injection

References

af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
www.dlink.com/en/security-bulletin/ (Vendor Advisory)
www.dlink.com.cn/techsupport/ProductInfo.aspx (Product)
github.com/mmmmmx1/dlink/blob/main/DIR-816/readme.md (Third Party Advisory)

Frequently asked questions

What is CVE-2023-39637?: CVE-2023-39637 is a critical-severity vulnerability in Dlink Dir-816, classified under Command Injection. CVSS score: 9.8/10. Published 2023-09-12.
How severe is CVE-2023-39637?: Critical severity. CVSS v3 base score is 9.8 out of 10.