---
id: CVE-2020-21913
title: >-
  International Components for Unicode (ICU-20850) v66.1 was discovered to
  contain a use after free bug in the pkg_createWithAssemblyCode function in the
  file tools/pkgdata/pkgdata.cpp.
summary: >-
  International Components for Unicode (ICU-20850) v66.1 was discovered to
  contain a use after free bug in the pkg_createWithAssemblyCode function in the
  file tools/pkgdata/pkgdata.cpp.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-416
vendor: unicode
product: international_components_for_unicode
affected:
  - international_components_for_unicode < 66.1
  - debian_linux = 9.0
  - debian_linux = 10.0
patched:
  - international_components_for_unicode 66.1
published: '2021-09-20'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:32.143'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-21913'
references:
  - url: 'https://github.com/unicode-org/icu/pull/886'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2021/10/msg00008.html'
    label: cve@mitre.org
  - url: 'https://unicode-org.atlassian.net/browse/ICU-20850'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2021/dsa-5014'
    label: cve@mitre.org
  - url: 'https://github.com/unicode-org/icu/pull/886'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/10/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://unicode-org.atlassian.net/browse/ICU-20850'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-5014'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.01213
epssPercentile: 0.67748
ingestedAt: '2026-10-14T10:25:41.192Z'
---

## Overview

International Components for Unicode (ICU-20850) v66.1 was discovered to contain a use after free bug in the pkg_createWithAssemblyCode function in the file tools/pkgdata/pkgdata.cpp.

## Affected

- `international_components_for_unicode < 66.1`
- `debian_linux = 9.0`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `international_components_for_unicode 66.1`