Deserialization of untrusted data in CloudLinux Inc Imunify360
Priority HIGH 69CWE-502Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-502.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01393 72nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| CloudLinux Inc | Imunify360 | 5.8; 5.9 | — | No fix listed | CNA |
- Imunify360 VendorCloudLinux Inc Affected 5.8; 5.9 Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cloudlinux:imunify360:5.8:*:*:*:*:*:*:* | 5.8 | Vulnerable | CloudLinux Inc |
| cpe:2.3:a:cloudlinux:imunify360:5.9:*:*:*:*:*:*:* | 5.9 | Vulnerable | CloudLinux Inc |
| cpe:2.3:a:cloudlinux:imunify360:5.10.2:*:*:*:*:*:*:* | 5.10.2 | Vulnerable | CloudLinux Inc |
- cpe:2.3:a:cloudlinux:imunify360:5.8:*:*:*:*:*:*:* Versions 5.8 Vulnerable ·CloudLinux Inc
- cpe:2.3:a:cloudlinux:imunify360:5.9:*:*:*:*:*:*:* Versions 5.9 Vulnerable ·CloudLinux Inc
- cpe:2.3:a:cloudlinux:imunify360:5.10.2:*:*:*:*:*:*:* Versions 5.10.2 Vulnerable ·CloudLinux Inc
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-21956
- 2026-10-03 Alias added: GHSA-q66p-gvmf-c9v2
References
Sources
- CVE-2021-21956 · CVE Program
- CVE-2021-21956 · NVD
- FIRST EPSS
- GHSA-q66p-gvmf-c9v2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences