CVE-2021-21327

Name: CVE-2021-21327
Creator: NVD / NIST
Published: 2021-03-08T17:15:13.197+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.25%

Last modified Jun 17, 2026

CVE-2021-21327 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features, licenses tracking and software auditing. In GLPI before version 9.5.4 non-authenticated user can remotely instantiate object of any class existing in the GLPI environment that can be used to carry out malicious attacks, or to start a “POP chain”. EPSS estimates a 2.25% chance of exploitation in the next 30 days.

Description

GLPI is an open-source asset and IT management software package that provides ITIL Service Desk features, licenses tracking and software auditing. In GLPI before version 9.5.4 non-authenticated user can remotely instantiate object of any class existing in the GLPI environment that can be used to carry out malicious attacks, or to start a “POP chain”. As an example of direct impact, this vulnerability affects integrity of the GLPI core platform and third-party plugins runtime misusing classes which implement some sensitive operations in their constructors or destructors. This is fixed in version 9.5.4.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.25%

80.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Glpi-Project	Glpi	< 9.5.4

References

http://packetstormsecurity.com/files/161680/GLPI-9.5.3-Unsafe-Reflection.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/glpi-project/glpi/releases/tag/9.5.4Release Notes
https://github.com/glpi-project/glpi/security/advisories/GHSA-qmw7-w2m4-rjwpVendor Advisory
http://packetstormsecurity.com/files/161680/GLPI-9.5.3-Unsafe-Reflection.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/glpi-project/glpi/releases/tag/9.5.4Release Notes
https://github.com/glpi-project/glpi/security/advisories/GHSA-qmw7-w2m4-rjwpVendor Advisory

Timeline

Published: Mar 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21327?

How severe is CVE-2021-21327?

CVE-2021-21327 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21327?

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-2021-21327?

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

Scan your code now

Source: NVD / NIST