CVE-2021-3924Network attack vector

Sensitive file disclosure via unrestricted CLI router

Published Nov 5, 2021 · Updated Aug 3, 2024

Path traversal in Grav 1.7.24 and earlier allows remote attackers to read sensitive server files through the built-in web server. The system/router.php handler concatenates DOCUMENT_ROOT with SCRIPT_NAME and returns matching files directly without blocking sensitive paths. Exposure requires an affected instance to be started with bin/grav server; conventional web-server deployments do not use this router.

CVSS severity7.5
High
EPSS probability4.36%
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 Grav 1.7.24 and earlier allows remote attackers to read sensitive server files through the built-in web server. The system/router.php handler concatenates DOCUMENT_ROOT with SCRIPT_NAME and returns matching files directly without blocking sensitive paths. Exposure requires an affected instance to be started with bin/grav server; conventional web-server deployments do not use this router.

The record

CVE
CVE-2021-3924
Published
Nov 5, 2021
Updated
Aug 3, 2024
Vendor
GetGrav
Product
Grav
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=unspecified <=1.7.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GetGrav · Gravversion=unspecified <=1.7.24

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.8huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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