CVE-2021-21956
CVSS v3
7.8
HIGH
EPSS Score
1.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
A php unserialize vulnerability exists in the Ai-Bolit functionality of CloudLinux Inc Imunify360 5.10.2. A specially-crafted malformed file can lead to potential arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.
Technical details
- Published
- 2022-04-14
Frequently asked questions
What is CVE-2021-21956?
A php unserialize vulnerability exists in the Ai-Bolit functionality of CloudLinux Inc Imunify360 5.10.2. A specially-crafted malformed file can lead to potential arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.
Is CVE-2021-21956 actively exploited?
Active exploitation of CVE-2021-21956 has not been confirmed. Its EPSS score was 1.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-21956?
CVE-2021-21956 has a CVSS v3 base score of 7.8 (HIGH severity).
Is CVE-2021-21956 affecting your environment?
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