What is CVE-2021-46456?

CVE-2021-46456 is a critical-severity vulnerability in Dlink Dir-823 Pro, classified under Command Injection. CVSS score: 9.8/10. Published 2022-02-04.

How severe is CVE-2021-46456?

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

Is CVE-2021-46456 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Dlink Dir-823 Pro

CVE-2021-46456

D-Link device D-Link DIR-823-Pro v1.0.2 was discovered to contain a command injection vulnerability in the function SetWLanACLSettings. This vulnerability allows attackers to execute arbitrary commands via the wl(0).(0)_maclist parameter.

Vulnerability class: Command Injection (OS Command Injection)

Published 2022-02-04 · last modified 2026-06-17.

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: 0.037 (89.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.037 · newest: 0.037 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

Public proof-of-concept exploits

References

www.dlink.com/en/security-bulletin/ (Vendor Advisory)
github.com/pjqwudi/my_vuln/blob/main/D-link/vuln_26/26.md (Broken Link)
supportannouncement.us.dlink.com/announcement/publication.aspx (Vendor Advisory)

Frequently asked questions

What is CVE-2021-46456?: CVE-2021-46456 is a critical-severity vulnerability in Dlink Dir-823 Pro, classified under Command Injection. CVSS score: 9.8/10. Published 2022-02-04.
How severe is CVE-2021-46456?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-46456 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.