CVE-2021-23370

Prototype Pollution

7.5 HighFix available

This affects the package swiper before 6.5.1.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

2.20%Up 0.7 points since Apr 14, 2021

What each source reports

CVE List Score used 7.5

Prototype Pollution

This affects the package swiper before 6.5.1.

Record: CVE-2021-23370
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
Updated: 2026-11-02

EUVDEUVD-2021-1143 7.5

This affects the package swiper before 6.5.1.

Record: EUVD-2021-1143
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
Updated: 2026-11-03

GitHub AdvisoriesGHSA-p3hc-fv2j-rp68 9.8

Prototype Pollution in swiper

Versions of the package swiper before 6.5.1 are susceptible to prototype pollution.

Record: GHSA-p3hc-fv2j-rp68
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-1321
Updated: 2026-11-02

NVD 7.5

This affects the package swiper before 6.5.1.

Record: CVE-2021-23370
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated: 2026-11-02

OSV 9.8

This affects the package swiper before 6.5.1.

Record: CVE-2021-23370
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-p3hc-fv2j-rp68 9.8

Prototype Pollution in swiper

Versions of the package swiper before 6.5.1 are susceptible to prototype pollution.

Record: GHSA-p3hc-fv2j-rp68
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-1321
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`swiper` npm	before 6.5.1	6.5.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-23370 is a high vulnerability (CVSS 7.5) in Nolimits4web Swiper, published April 12, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.20%, the 82nd percentile. Fixed in swiper 6.5.1.

References

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