CVE-2020-10964

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-03-25 · updated 2026-06-17
Weakness: CWE-434

Description

Serendipity before 2.3.4 on Windows allows remote attackers to execute arbitrary code because the filename of a renamed file may end with a dot. This file may then be renamed to have a .php filename.

Affected products

s9y Serendipity: before 2.3.4 — fixed in 2.3.4

How to fix

Upgrade to a fixed version: s9y Serendipity 2.3.4. Check the vendor advisory for mitigations.

References

https://blog.s9y.org/archives/290-Serendipity-2.3.4-released-security-update.html
https://github.com/s9y/Serendipity/releases/tag/2.3.4
https://blog.s9y.org/archives/290-Serendipity-2.3.4-released-security-update.html
https://github.com/s9y/Serendipity/releases/tag/2.3.4

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