CVE-2021-24384Public exploitNetwork attack vector

Unauthenticated object injection via AJAX deserialization

Published Jul 6, 2021 · Updated Aug 3, 2024

PHP object injection in BearDev JoomSport before 5.1.8 allows remote attackers to supply serialized objects through an AJAX request. The joomsport_md_load action passes the shattr POST parameter to PHP unserialize without validating the serialized object type. The action is exposed without authentication; JoomSport has no usable gadget chain, but a compatible chain in another installed plugin enables code execution.

CVSS severity9.8
Critical
EPSS probability2.07%
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 BearDev JoomSport before 5.1.8 allows remote attackers to supply serialized objects through an AJAX request. The joomsport_md_load action passes the shattr POST parameter to PHP unserialize without validating the serialized object type. The action is exposed without authentication; JoomSport has no usable gadget chain, but a compatible chain in another installed plugin enables code execution.

The record

CVE
CVE-2021-24384
Published
Jul 6, 2021
Updated
Aug 3, 2024
Vendor
BearDev
Product
JoomSport
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 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=5.1.8 <5.1.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BearDev · JoomSportversion=5.1.8 <5.1.8

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

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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