CVE-2021-3797Public exploitNetwork attack vector

Unauthorized actions via CSRF token type juggling

Published Sep 15, 2021 · Updated Aug 3, 2024

CSRF bypass in Hestia Control Panel 1.4.13 and earlier allows remote attackers to perform unauthorized control-panel actions. Affected web endpoints use PHP loose inequality operators to compare supplied CSRF tokens with session tokens, allowing type juggling to treat nonidentical values as equal. Exploitation requires a request associated with an authenticated session, and the resulting action remains bounded by that session's privileges.

CVSS severity9.8
Critical
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF bypass in Hestia Control Panel 1.4.13 and earlier allows remote attackers to perform unauthorized control-panel actions. Affected web endpoints use PHP loose inequality operators to compare supplied CSRF tokens with session tokens, allowing type juggling to treat nonidentical values as equal. Exploitation requires a request associated with an authenticated session, and the resulting action remains bounded by that session's privileges.

The record

CVE
CVE-2021-3797
Published
Sep 15, 2021
Updated
Aug 3, 2024
Vendor
HestiaCP
Product
Hestia Control Panel
Classifications
CWE-597, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 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=unspecified <=1.4.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HestiaCP · Hestia Control Panelversion=unspecified <=1.4.13

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.8huntr.devCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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

Weakness, pattern, technique

CWE-597Use of Wrong Operator in String Comparison
T1190Exploit Public-Facing Application

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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