CVE-2021-30463Public exploit

User-to-Administrator escalation via symlink-following chmod

Published Apr 8, 2021 · Updated Aug 3, 2024

Link following in VestaCP 0.9.8-24 and earlier allows local users to take over the Administrator account through a domain request. The v-add-web-domain script runs chmod on an existing user-controlled domain path without rejecting symlinks, changing permissions on linked directories and admin user.conf. A standard VestaCP user account and permission to create a web domain are required; exposed RKEY data permits an Administrator password reset.

CVSS severity7.8
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link following in VestaCP 0.9.8-24 and earlier allows local users to take over the Administrator account through a domain request. The v-add-web-domain script runs chmod on an existing user-controlled domain path without rejecting symlinks, changing permissions on linked directories and admin user.conf. A standard VestaCP user account and permission to create a web domain are required; exposed RKEY data permits an Administrator password reset.

The record

CVE
CVE-2021-30463
Published
Apr 8, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-59, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 8, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1068Exploitation for Privilege Escalation

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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