CVE-2022-37621Network attack vector

Prototype pollution via unchecked shim cache keys

Published Oct 28, 2022 · Updated May 7, 2025

Prototype pollution in browserify-shim 3.8.15 and earlier allows remote attackers to alter inherited object properties via crafted shim paths. The resolveShims path stores fullPath-derived keys in the shared shimsByPath cache without rejecting prototype-control property names. Exploitation requires attacker influence over shim configuration processed during bundling; published sources identify no downstream gadget or concrete data, code-execution, or service consequence.

CVSS severity9.8
Critical
EPSS probability1.12%
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 browserify-shim 3.8.15 and earlier allows remote attackers to alter inherited object properties via crafted shim paths. The resolveShims path stores fullPath-derived keys in the shared shimsByPath cache without rejecting prototype-control property names. Exploitation requires attacker influence over shim configuration processed during bundling; published sources identify no downstream gadget or concrete data, code-execution, or service consequence.

The record

CVE
CVE-2022-37621
Published
Oct 28, 2022
Updated
May 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 28, 2022CVE publishedPublication date reported by the CVE source.
  2. May 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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