CVE-2021-24579Network attack vector

Conditional code execution via unsafe AJAX deserialization

Published Aug 30, 2021 · Updated Aug 3, 2024

PHP object injection in BoldThemes Bold Page Builder before 3.1.6 allows remote authenticated users to trigger conditional code execution. The bt_bb_get_grid AJAX action passes attacker-controlled input directly to PHP unserialize() without validation or sanitization. Exploitation requires a low-privileged WordPress account and a separate installed plugin that supplies a usable object gadget chain.

CVSS severity8.8
High
EPSS probability8.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in BoldThemes Bold Page Builder before 3.1.6 allows remote authenticated users to trigger conditional code execution. The bt_bb_get_grid AJAX action passes attacker-controlled input directly to PHP unserialize() without validation or sanitization. Exploitation requires a low-privileged WordPress account and a separate installed plugin that supplies a usable object gadget chain.

The record

CVE
CVE-2021-24579
Published
Aug 30, 2021
Updated
Aug 3, 2024
Vendor
BoldThemes
Product
Bold Page Builder
Classifications
CWE-502, CAPEC-586, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 30, 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=3.1.6 <3.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

BoldThemes · Bold Page Builderversion=3.1.6 <3.1.6

Published CVSS scores

6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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