CVE-2020-7600Public exploitNetwork attack vector

Object prototype modification via unchecked handler keys

Published Mar 12, 2020 · Updated Aug 4, 2024

Prototype pollution in Diego Haz Querymen before 2.1.4 allows remote attackers to modify Object prototype properties via handler inputs. The exported handler(type, name, fn) function assigns fn to handlers[type][name] without rejecting constructor or proto, allowing chosen keys to reach Object.prototype. Reachability requires a consuming application to pass attacker-controlled values into this API; exploitation changes inherited properties in the Node.js process, with application-specific integrity effects.

CVSS severity5.3
Medium
EPSS probability1.16%
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 Diego Haz Querymen before 2.1.4 allows remote attackers to modify Object prototype properties via handler inputs. The exported handler(type, name, fn) function assigns fn to handlers[type][name] without rejecting constructor or proto, allowing chosen keys to reach Object.prototype. Reachability requires a consuming application to pass attacker-controlled values into this API; exploitation changes inherited properties in the Node.js process, with application-specific integrity effects.

The record

CVE
CVE-2020-7600
Published
Mar 12, 2020
Updated
Aug 4, 2024
Vendor
Diego Haz
Product
Querymen
Classifications
CWE-1321, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions prior to 2.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Diego Haz · Querymenversion=All versions prior to 2.1.4

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N

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