CVE-2021-23413

Jszip vulnerability

CVSS

5.3

EPSS

3.3%

EPSS pct

87th

Exploited

No known

This affects the package jszip before 3.7.0. Crafting a new zip file with filenames set to Object prototype values (e.g __proto__, toString, etc) results in a returned object with a modified prototype instance.

Affected vendor

Jszip Project

Affected product

Jszip

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Published

2021-07-25

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to availability.

Its EPSS score of 3.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 87% of all scored CVEs.

Check your external exposure to CVE-2021-23413

Confirm whether Jszip Project Jszip is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-23413.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-23413

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-23413 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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