CVE-2020-36771Public exploit

Cross-user code execution via exposed authentication token

Published Jan 22, 2024 · Updated Jun 20, 2025

Token disclosure in CloudLinux CageFS 7.1.1-1 and earlier allows local users to execute code as another user via proxyexec. CageFS wrapper scripts read /var/.cagefs/.cagefs.token and expose its value as a proxyexec command-line argument visible in the process list. Exploitation requires disabled lve_namespaces or virtualized /proc protection and grants the victim user's privileges through the CageFS daemon.

CVSS severity7.8
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Token disclosure in CloudLinux CageFS 7.1.1-1 and earlier allows local users to execute code as another user via proxyexec. CageFS wrapper scripts read /var/.cagefs/.cagefs.token and expose its value as a proxyexec command-line argument visible in the process list. Exploitation requires disabled lve_namespaces or virtualized /proc protection and grants the victim user's privileges through the CageFS daemon.

The record

CVE
CVE-2020-36771
Published
Jan 22, 2024
Updated
Jun 20, 2025
Vendor
CloudLinux
Product
CageFS
Classifications
CWE-214, T1057
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 20, 2025Record 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=7.1.1-1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

CloudLinux · CageFSversion=7.1.1-1

Published CVSS scores

7.8SBA ResearchCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-214Invocation of Process Using Visible Sensitive Information
T1057Process Discovery

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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