CVE-2021-27112Public exploitNetwork attack vector

Unauthenticated code execution via unfiltered image download

Published Apr 15, 2021 · Updated Aug 3, 2024

Remote code execution in LightCMS 1.3.5 allows remote attackers to execute arbitrary PHP code through the external-image downloader. The catchImage action in NEditorController accepts an unfiltered remote URL and stores attacker-supplied PHP content as a server-side file that the web server executes. No authentication or user interaction is required, and the same path also permits arbitrary server-side file reads.

CVSS severity9.8
Critical
EPSS probability2.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in LightCMS 1.3.5 allows remote attackers to execute arbitrary PHP code through the external-image downloader. The catchImage action in NEditorController accepts an unfiltered remote URL and stores attacker-supplied PHP content as a server-side file that the web server executes. No authentication or user interaction is required, and the same path also permits arbitrary server-side file reads.

The record

CVE
CVE-2021-27112
Published
Apr 15, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5TenableAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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.

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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

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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