What is CVE-2020-25367?

CVE-2020-25367 is a critical-severity vulnerability in Dlink Dir-823g, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-11-04.

How severe is CVE-2020-25367?

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

RCE in Dlink Dir-823g

CVE-2020-25367

A command injection vulnerability was discovered in the HNAP1 protocol in D-Link DIR-823G devices with firmware V1.0.2B05. An attacker is able to execute arbitrary web scripts via shell metacharacters in the Captcha field to Login.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-11-04 · 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: 0.086 (95.1th percentile), scored 2026-10-31.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.086 · newest: 0.086 · change: 0.000

Affected products

Dlink Dir-823g
Dlink Dir-823g Firmware — versions 1.0.2b05

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
www.dlink.com/en/security-bulletin/ (Not Applicable, Vendor Advisory)
github.com/sek1th/iot/blob/master/dir823g_3.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25367?: CVE-2020-25367 is a critical-severity vulnerability in Dlink Dir-823g, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-11-04.
How severe is CVE-2020-25367?: Critical severity. CVSS v3 base score is 9.8 out of 10.