CVE-2021-39211
Published: April 11, 2026
Official Description
GLPI is a free Asset and IT management software package. Starting in version 9.2 and prior to version 9.5.6, the telemetry endpoint discloses GLPI and server information. This issue is fixed in version 9.5.6. As a workaround, remove the file `ajax/telemetry.php`, which is not needed for usual functions of GLPI.
Risk Analysis
This vulnerability in GLPI software allows an attacker to gather sensitive GLPI and server information through a telemetry endpoint. While no CVSS or EPSS scores are provided, its inclusion in CISA's KEV catalog indicates confirmed exploitation, making it an urgent concern for affected systems.
Active exploitation of this vulnerability has been observed in the wild. The flaw is remotely exploitable, as it involves an HTTP endpoint.
Upgrade GLPI to version 9.5.6 or later. As a workaround, remove the 'ajax/telemetry.php' file, which is not essential for GLPI's normal operation.
Technical Analysis
CVE-2021-39211 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-39211 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-39211 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1