What is CVE-2021-39213?

CVE-2021-39213 is a medium-severity vulnerability in Glpi-Project Glpi, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.8/10. Published 2021-09-15.

How severe is CVE-2021-39213?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Glpi-Project Glpi

CVE-2021-39213

GLPI is a free Asset and IT management software package. Starting in version 9.1 and prior to version 9.5.6, GLPI with API Rest enabled is vulnerable to API bypass with custom header injection. This issue is fixed in version 9.5.6. One may disable API Rest as a workaround.

Published 2021-09-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.1th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Glpi-Project Glpi — versions >= 9.1, < 9.5.6

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

github.com/glpi-project/glpi/releases/tag/9.5.6 (Third Party Advisory, Release Notes)
github.com/glpi-project/glpi/security/advisories/GHSA-6w9f-2m6g-5777 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-39213?: CVE-2021-39213 is a medium-severity vulnerability in Glpi-Project Glpi, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.8/10. Published 2021-09-15.
How severe is CVE-2021-39213?: Medium severity. CVSS v3 base score is 6.8 out of 10.