CVE-2021-23592Network attack vector

Application compromise via unsafe cache deserialization

Published May 6, 2022 · Updated Sep 16, 2024

Unsafe deserialization in ThinkPHP before 6.0.12 allows remote attackers to compromise application data through crafted cache input. The cache Driver sends nonnumeric cache values to its configured unserialize callback without validating whether serialized object data is trusted. Exploitation requires attacker-controlled data to reach an application's cache backend, with confidentiality and integrity loss and limited service interruption.

CVSS severity7.7
High
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in ThinkPHP before 6.0.12 allows remote attackers to compromise application data through crafted cache input. The cache Driver sends nonnumeric cache values to its configured unserialize callback without validating whether serialized object data is trusted. Exploitation requires attacker-controlled data to reach an application's cache backend, with confidentiality and integrity loss and limited service interruption.

The record

CVE
CVE-2021-23592
Published
May 6, 2022
Updated
Sep 16, 2024
Vendor
ThinkPHP
Product
ThinkPHP
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 <6.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThinkPHP · ThinkPHPversion=unspecified <6.0.12

Published CVSS scores

7.7Snyk CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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