What is CVE-2021-21956?

CVE-2021-21956 is a high-severity vulnerability in Cloudlinux Imunify360, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2022-04-14.

How severe is CVE-2021-21956?

High severity. CVSS v3 base score is 7.8 out of 10.

Deserialization in Cloudlinux Imunify360

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.013 (67.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Cloudlinux Imunify360 — versions 5.8, 5.9, 5.10.2
Cloudlinux Inc Imunify360 — versions 5.8, 5.9

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

talos-cna@cisco.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-21956?: CVE-2021-21956 is a high-severity vulnerability in Cloudlinux Imunify360, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2022-04-14.
How severe is CVE-2021-21956?: High severity. CVSS v3 base score is 7.8 out of 10.