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Fencer Intel
medium 5.3

CVE-2021-23413 json

Denial of Service (DoS)

published 5y ago modified 4mo ago also GHSA-jg8v-48h5-wgxg , EUVD-2021-1773

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm jszip 2.7.0, 3.7.0
  • n/a jszip 3.7.0
  • node-jszip Debian 14, Debian 13, Debian 12 3.5.0+dfsg-2

debian advisories DEBIAN-CVE-2021-23413

Is CVE-2021-23413 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-23413 updated cvss 5.3

jszip: crafting a new zip file with filenames set to object prototype values results in a returned object with a modified prototype instance

  • Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8 Red Hat Quay 3 quay/quay-rhel8
    affected: no fix planned “Will not fix”
  • Red Hat Fuse 7 io.apicurio-apicurito io.apicurio-apicurito
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.44% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-JSZIP-1251497 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1251498 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1251499 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm jszip
>=3.0.0, <3.7.0
<2.7.0
3.7.0
2.7.0

Affected products

  • n/a jszip

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.