CVE-2024-21876Public exploitNetwork attack vector

Unauthenticated file access via unsanitized locale parameter

Published Aug 10, 2024 · Updated Mar 11, 2025

Path traversal in Enphase IQ Gateway 4.x through 8.2.4224 allows remote attackers to access or create arbitrary files via a URL parameter. The get_locale function in envoy.rb passes the unsanitized locale value to CacheUtils.cache_file, which joins it into a /tmp/cache path without enforcing that the result remains inside that directory. Exploitation requires network access to a cacheable /home or /production request; public exposure is nondefault, and the standalone flaw permits arbitrary device-file access or creation.

CVSS severity9.3
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Enphase IQ Gateway 4.x through 8.2.4224 allows remote attackers to access or create arbitrary files via a URL parameter. The get_locale function in envoy.rb passes the unsanitized locale value to CacheUtils.cache_file, which joins it into a /tmp/cache path without enforcing that the result remains inside that directory. Exploitation requires network access to a cacheable /home or /production request; public exposure is nondefault, and the standalone flaw permits arbitrary device-file access or creation.

The record

CVE
CVE-2024-21876
Published
Aug 10, 2024
Updated
Mar 11, 2025
Vendor
Enphase Energy
Product
Envoy Communications Gateway
Classifications
CWE-22, CAPEC-165, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4 <8.2.4225

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Enphase Energy · Envoy Communications Gatewayversion=4 <8.2.4225
Enphase Energy · IQ Gatewayversion=4.x; version=5.x; version=6.x; version=7.x; version=8.0 <8.2.4225

Published CVSS scores

9.2DIVDCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/S:P/AU:Y/R:I/V:C/RE:H
9.3DIVDCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/S:N/AU:Y/V:D/RE:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-165File Manipulation
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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