CVE-2021-41097Public exploitNetwork attack vector

Object prototype modification via unchecked query keys

Published Sep 27, 2021 · Updated Aug 4, 2024

Prototype pollution in Aurelia Path before 1.1.7 allows remote attackers to modify Object.prototype through a crafted query string. parseQueryString passes bracketed query keys to parseComplexParam, which follows proto as an object property and assigns attacker-controlled values without rejecting that key. An application must parse attacker-controlled text, commonly location.search through aurelia-router; successful exploitation changes inherited properties for application objects.

CVSS severity9.1
Critical
EPSS probability4.90%
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 Aurelia Path before 1.1.7 allows remote attackers to modify Object.prototype through a crafted query string. parseQueryString passes bracketed query keys to parseComplexParam, which follows proto as an object property and assigns attacker-controlled values without rejecting that key. An application must parse attacker-controlled text, commonly location.search through aurelia-router; successful exploitation changes inherited properties for application objects.

The record

CVE
CVE-2021-41097
Published
Sep 27, 2021
Updated
Aug 4, 2024
Vendor
Aurelia
Product
Path
Classifications
CWE-1321, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2021CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Aurelia · Pathversion=< 1.1.7

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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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