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Vulnerabilities

Vulnerability · CVE-2025-34061

A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations.

Published Jul 3, 2025 · catalog updated Jul 7, 2025 · Henan Xiaopi Security Technology Co., Ltd. PHPStudy

Check if you run it

No confirmed exploitation is on record for CVE-2025-34061. EPSS is 1.94%. Act only if a listed version of Henan Xiaopi Security Technology Co., Ltd. PHPStudy is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.94%
Remediation
Vendor / distro source
Affected products
vendor Henan Xiaopi Security Technology Co., Ltd. PHPStudy 2016 ≤2018

A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations. The backdoor listens for base64-encoded PHP payloads in the Accept-Charset HTTP header of incoming requests, decodes and executes the payload without proper validation. This leads to remote code execution as the web server user, compromising the affected system.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Henan Xiaopi Security Technology Co., Ltd. PHPStudy 2016 ≤20182016 ≤2018

How to fix CVE-2025-34061

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-34061. EPSS is 1.94%. Act only if a listed version of Henan Xiaopi Security Technology Co., Ltd. PHPStudy is installed.

Which versions are affected?

Compare what you have installed with Henan Xiaopi Security Technology Co., Ltd. PHPStudy 2016 ≤2018 2016 ≤2018. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.94%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 3, 2025 · EUVD

    Detected

    A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations. The backdoor listens for base64-encoded PHP payloads in the Accept-Charset HTTP header of incoming requests, decodes and executes the payload without proper validation. This leads to remote code execution as the web server user, compromising the affecte

  2. Jul 7, 2025 · EUVD

    Updated

    A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations. The backdoor listens for base64-encoded PHP payloads in the Accept-Charset HTTP header of incoming requests, decodes and executes the payload without proper validation. This leads to remote code execution as the web server user, compromising the affecte

Sources

  • CVE.orgVulnerability recordCVE-2025-34061

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-34061

    30-day exploitation probability 1.94%

    first.org
  • EUVDVulnerability recordEUVD-2025-19906

    A backdoor in PHPStudy versions 2016 through 2018 allows unauthenticated remote attackers to execute arbitrary PHP code on affected installations. The backdoor listens for base64-encoded PHP payloads in the Accept-Charset HTTP header of incoming requests, decodes and executes the

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 21, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.