CVE-2021-32836

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.

• CWE-94
• CWE-502

• https://github.com/zstackio/zstack/security/advisories/GHSA-jfvq-548h-342xThird Party Advisory
• https://securitylab.github.com/advisories/GHSL-2021-087-zstack/Exploit, Third Party Advisory
• https://github.com/zstackio/zstack/security/advisories/GHSA-jfvq-548h-342xThird Party Advisory
• https://securitylab.github.com/advisories/GHSL-2021-087-zstack/Exploit, Third Party Advisory

Published

Sep 9, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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