Pre-auth unsafe deserialization in ZStack
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-94.
Summary
ZStack is open source IaaS(infrastructure as a service) software. In ZStack before versions 3.10.12 and 4.1.6 there is a pre-auth unsafe deserialization vulnerability in the REST API. An attacker in control of the request body will be able to provide both the class name and the data to be deserialized and therefore will be able to instantiate an arbitrary type and assign arbitrary values to its fields. This issue may lead to a Denial Of Service. If a suitable gadget is available, then an attacker may also be able to exploit this vulnerability to gain pre-auth remote code execution. For additional details see the referenced GHSL-2021-087.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| zstackio | zstack | before 3.10.12; 4.0.0 to before 4.1.6 | 3.10.12, 4.1.6 | Patch available | CNA |
- zstack Vendorzstackio Affected before 3.10.12; 4.0.0 to before 4.1.6 Fixed in 3.10.12, 4.1.6 Patch available CNA
Remediation
- Fix · CNA zstack (zstackio) Fixed in 3.10.12, 4.1.6
Timeline
- 2026-10-02 Threatist record created from CVE-2021-32836
- 2026-10-03 Alias added: GHSA-gpj5-98pq-4552
References
More Zstack vulnerabilities
- TI-2023-24935 ZStack Cloud version 3.10.38 and before allows unauthenticated API access to the list of… CVSS 3.1HIGH 8.8
Sources
- CVE-2021-32836 · CVE Program
- CVE-2021-32836 · NVD
- FIRST EPSS
- GHSA-gpj5-98pq-4552 · GitHub Advisory Database · CC BY 4.0
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