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No exploitation reportedFix available

CVE-2021-23568

No exploitation reported by the sources we read.

  • Published2022-01-10
  • Fixed in1.0.1
  • WeaknessCWE-1321

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.

Timeline

dates in UTC
  1. 2022-01-1014:10CVE publishedNVD

Versions per branch

NVD · OSV
Eggjs extend2
BranchAffectedFixed in
1.0< 1.0.11.0.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Eggjs extend2 to 1.0.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.3known since 2026-10-23
  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • NVDweakness (CWE)CWE-1321read 2026-10-23
  • FIRST EPSSEPSS score1.5 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2022-01-11

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2022-01-10
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-gjm5-83cw-p3p2

Frequently asked questions

What is CVE-2021-23568?

The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.

Is CVE-2021-23568 actively exploited?

Active exploitation of CVE-2021-23568 has not been confirmed. Its EPSS score was 1.5% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23568?

CVE-2021-23568 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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