CVE-2022-21213Public exploitNetwork attack vector

Service disruption via unchecked recursive object keys

Published Jun 17, 2022 · Updated Sep 16, 2024

Prototype pollution in Mout mout 1.2.3 and earlier allows remote attackers to disrupt consuming applications via crafted object keys. The deepFillIn and deepMixIn routines recursively use unchecked keys to access target objects, permitting constructor.prototype paths to alter inherited properties. Exposure requires an application to pass attacker-controlled objects into an affected recursive merge, and the reported consequence is an application crash or other service interruption.

CVSS severity7.5
High
EPSS probability2.11%
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 Mout mout 1.2.3 and earlier allows remote attackers to disrupt consuming applications via crafted object keys. The deepFillIn and deepMixIn routines recursively use unchecked keys to access target objects, permitting constructor.prototype paths to alter inherited properties. Exposure requires an application to pass attacker-controlled objects into an affected recursive merge, and the reported consequence is an application crash or other service interruption.

The record

CVE
CVE-2022-21213
Published
Jun 17, 2022
Updated
Sep 16, 2024
Vendor
Mout
Product
mout
Classifications
CWE-1321, CAPEC-77
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mout · moutversion=0 <unspecified

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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')
CAPEC-77Manipulating User-Controlled Variables

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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