What is CVE-2021-45623?

CVE-2021-45623 is a high-severity vulnerability in NETGEAR R7800, classified under Command Injection. CVSS score: 8.3/10. Published 2021-12-26.

How severe is CVE-2021-45623?

High severity. CVSS v3 base score is 8.3 out of 10.

RCE in NETGEAR R7800

CVE-2021-45623

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects R7800 before 1.0.2.74, R9000 before 1.0.5.2, and XR500 before 2.3.2.66.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-12-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.017 (76.2th percentile), scored 2026-10-05.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.2% 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: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

References

kb.netgear.com/000064449/Security-Advisory-for-Pre-Authentication-Command-Injec… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-45623?: CVE-2021-45623 is a high-severity vulnerability in NETGEAR R7800, classified under Command Injection. CVSS score: 8.3/10. Published 2021-12-26.
How severe is CVE-2021-45623?: High severity. CVSS v3 base score is 8.3 out of 10.