What is CVE-2021-45655?

CVE-2021-45655 is a medium-severity vulnerability in NETGEAR R6400, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.9/10. Published 2021-12-26.

How severe is CVE-2021-45655?

Medium severity. CVSS v3 base score is 6.9 out of 10.

Vulnerability in NETGEAR R6400

CVE-2021-45655

NETGEAR R6400 devices before 1.0.1.70 are affected by server-side injection.

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

CVSS v3 metric

CVSS v3 base score 6.9 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

kb.netgear.com/000064069/Security-Advisory-for-Server-Side-Injection-on-R6400-P… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-45655?: CVE-2021-45655 is a medium-severity vulnerability in NETGEAR R6400, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.9/10. Published 2021-12-26.
How severe is CVE-2021-45655?: Medium severity. CVSS v3 base score is 6.9 out of 10.