What is CVE-2024-21878?

CVE-2024-21878 is a critical-severity vulnerability in Enphase Envoy, classified under Command Injection. CVSS score: 9.8/10. Published 2024-08-12.

How severe is CVE-2024-21878?

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

RCE in Enphase Envoy

CVE-2024-21878

Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Enphase IQ Gateway (formerly known as Envoy) allows OS Command Injection. This vulnerability is present in an internal script.This issue affects Envoy: from 4.x up to and including 8.x and is currently unpatched.

Vulnerability class: Command Injection (OS Command Injection)

Published 2024-08-12 · 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: 0.014 (72.3th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: +0.000

Affected products

Weakness classification (CWE)

References

csirt.divd.nl/CVE-2024-21878 (Third Party Advisory, third-party-advisory)
csirt.divd.nl/DIVD-2024-00011 (related, Third Party Advisory)
enphase.com/cybersecurity/advisories/ensa-2024-3 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2024-21878?: CVE-2024-21878 is a critical-severity vulnerability in Enphase Envoy, classified under Command Injection. CVSS score: 9.8/10. Published 2024-08-12.
How severe is CVE-2024-21878?: Critical severity. CVSS v3 base score is 9.8 out of 10.