CVE-2021-32829Public exploitNetwork attack vector

Authenticated code execution via Groovy annotation escape

Published Aug 17, 2021 · Updated Aug 3, 2024

Code injection in affected ZStack REST API releases allows remote authenticated users to execute arbitrary code through a batch query. BatchQuery.query parses and runs the user-controlled script parameter as Groovy while SandboxTransformer fails to restrict code embedded in Java annotations. Any non-privileged account can supply an annotation-based metaprogramming escape and run commands with the management service's permissions.

CVSS severity9.6
Critical
EPSS probability2.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in affected ZStack REST API releases allows remote authenticated users to execute arbitrary code through a batch query. BatchQuery.query parses and runs the user-controlled script parameter as Groovy while SandboxTransformer fails to restrict code embedded in Java annotations. Any non-privileged account can supply an annotation-based metaprogramming escape and run commands with the management service's permissions.

The record

CVE
CVE-2021-32829
Published
Aug 17, 2021
Updated
Aug 3, 2024
Vendor
ZStack
Product
ZStack
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=3.10.0, < 3.10.8
  2. Affected versionversion=< 3.8.21
  3. Affected versionversion=>=4.0.0, < 4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ZStack · ZStackversion=>=3.10.0, < 3.10.8; version=< 3.8.21; version=>=4.0.0, < 4.1.0

Published CVSS scores

9.6GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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