CVE-2020-12471

Name: CVE-2020-12471
Creator: NVD / NIST
Published: 2020-04-29T21:15:12.18+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.76%

Last modified Jun 17, 2026

CVE-2020-12471 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. MonoX through 5.1.40.5152 allows remote code execution via HTML5Upload.ashx or Pages/SocialNetworking/lng/en-US/PhotoGallery.aspx because of deserialization in ModuleGallery.HTML5Upload, ModuleGallery.SilverLightUploadModule, HTML5Upload, and SilverLightUploadHandler.. EPSS estimates a 2.76% chance of exploitation in the next 30 days.

Description

MonoX through 5.1.40.5152 allows remote code execution via HTML5Upload.ashx or Pages/SocialNetworking/lng/en-US/PhotoGallery.aspx because of deserialization in ModuleGallery.HTML5Upload, ModuleGallery.SilverLightUploadModule, HTML5Upload, and SilverLightUploadHandler.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.76%

84.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Mono	Monox	<= 5.1.40.5152

References

https://github.com/belong2yourself/vulnerabilities/tree/master/MonoX%20CMS/Remote%20Code%20Execution%20via%20Insecure%20DeserializationExploit, Third Party Advisory
https://github.com/belong2yourself/vulnerabilities/tree/master/MonoX%20CMS/Remote%20Code%20Execution%20via%20Insecure%20DeserializationExploit, Third Party Advisory

Timeline

Published: Apr 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12471?

How severe is CVE-2020-12471?

CVE-2020-12471 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.76% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12471?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12471?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST