CVE-2024-21509Public exploitNetwork attack vector

Prototype pollution via unsafe result-object creation

Published Apr 10, 2024 · Updated Aug 22, 2024

Prototype pollution in Sidorares MySQL2 before 3.9.4 allows remote attackers to alter result-object prototypes via crafted field names. The generated text and binary parsers placed database-derived field names onto ordinary JavaScript objects, allowing constructor or prototype keys to affect inherited state. Exploitation requires application-controlled queries or a malicious MySQL server to supply crafted result metadata; successful attacks alter application object state, with no reported confidentiality impact.

CVSS severity6.5
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Sidorares MySQL2 before 3.9.4 allows remote attackers to alter result-object prototypes via crafted field names. The generated text and binary parsers placed database-derived field names onto ordinary JavaScript objects, allowing constructor or prototype keys to affect inherited state. Exploitation requires application-controlled queries or a malicious MySQL server to supply crafted result metadata; successful attacks alter application object state, with no reported confidentiality impact.

The record

CVE
CVE-2024-21509
Published
Apr 10, 2024
Updated
Aug 22, 2024
Vendor
Sidorares
Product
MySQL2
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=0 <3.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sidorares · MySQL2version=0 <3.9.4

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
6.5SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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.

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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-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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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