HOMEVULNERABILITIESCVE-2021-23433
CRITICAL

CVE-2021-23433

CWE-1321Published: November 19, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The package algoliasearch-helper before 3.6.2 are vulnerable to Prototype Pollution due to use of the merge function in src/SearchParameters/index.jsSearchParameters._parseNumbers without any protection against prototype properties. Note that this vulnerability is only exploitable if the implementation allows users to define arbitrary search patterns.

NVD Source

Technical Analysis

CVE-2021-23433 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

algolia1 product(s)
algoliasearch-helper
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817edd
PATCHhttps://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817edd
ADVISORYhttps://snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421
ADVISORYhttps://snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421

All References (6)

→
https://github.com/algolia/algoliasearch-helper-js/blob/3.5.5/src/SearchParameters/index.js%23L291Broken Link
→
https://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817eddPatch · Third Party Advisory
→
https://snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421Exploit · Third Party Advisory
→
https://github.com/algolia/algoliasearch-helper-js/blob/3.5.5/src/SearchParameters/index.js%23L291Broken Link
→
https://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817eddPatch · Third Party Advisory
→
https://snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2021-23433
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-1321
CISA KEVNo
Affected1 vendor(s)
PublishedNov 19, 2021

Related CVEs (CWE-1321)

CVE-2024-39008
10.0
CVE-2026-25881
10.0
CVE-2023-26121
10.0
CVE-2021-23594
10.0
CVE-2026-25150
10.0
CVE-2020-12079
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-23433 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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