CVE-2021-21425Public exploitNetwork attack vector

Unauthenticated command execution via scheduler YAML write

Published Apr 7, 2021 · Updated Aug 3, 2024

Improper access control in GetGrav Grav Admin Plugin 1.10.7 and earlier allows remote attackers to execute commands via the admin interface. The administrator controller accepts unauthenticated SaveDefault requests for scheduler configuration, persisting attacker-supplied job data in YAML for scheduler execution. Network access to the admin route is sufficient; exploitation can alter site content, take over an administrator account, or run commands as the web-server user.

CVSS severity9.3
Critical
EPSS probability80.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in GetGrav Grav Admin Plugin 1.10.7 and earlier allows remote attackers to execute commands via the admin interface. The administrator controller accepts unauthenticated SaveDefault requests for scheduler configuration, persisting attacker-supplied job data in YAML for scheduler execution. Network access to the admin route is sufficient; exploitation can alter site content, take over an administrator account, or run commands as the web-server user.

The record

CVE
CVE-2021-21425
Published
Apr 7, 2021
Updated
Aug 3, 2024
Vendor
GetGrav
Product
Grav Admin Plugin
Classifications
CWE-284, T1059, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 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=<= 1.10.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GetGrav · Grav Admin Pluginversion=<= 1.10.7

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1059Command and Scripting Interpreter
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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