CVE-2021-24307

All in One SEO Pack < 4.1.0.2 - Admin RCE via unserialize

HIGH
8.8
CVSS Score
Published: May 24, 2021 at 10:58 AM UTC
Updated: June 17, 2026 at 03:39 AM UTC
2 products affected across 2 vendorsAll in One SeoAll in One Seo

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Severity
HIGH8.8
Exploit prediction
EPSS 53%

Description

The All in One SEO – Best WordPress SEO Plugin – Easily Improve Your SEO Rankings before 4.1.0.2 enables authenticated users with "aioseo_tools_settings" privilege (most of the time admin) to execute arbitrary code on the underlying host. Users can restore plugin's configuration by uploading a backup .ini file in the section "Tool > Import/Export". However, the plugin attempts to unserialize values of the .ini file. Moreover, the plugin embeds Monolog library which can be used to craft a gadget chain and thus trigger system command execution.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All in One Seo· Aioseowordpress-plugin
95%
v < 4.1.0.2
Affected range stops below 4.1.0.2, so it looks safe — our inference, not a vendor statement
v < 4.1.0.2
Affected range stops below 4.1.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCRelease NotesVendor Advisory
https://aioseo.com/changelog/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-502

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