CVE-2020-21913

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-09-20 · updated 2026-10-14
Weakness: CWE-416

Description

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 products

Debian Linux: 9.0, 10.0
Unicode International Components For Unicode: before 66.1 — fixed in 66.1

How to fix

Upgrade to a fixed version: Unicode International Components For Unicode 66.1. Check the vendor advisory for mitigations.

References

https://github.com/unicode-org/icu/pull/886
https://lists.debian.org/debian-lts-announce/2021/10/msg00008.html
https://unicode-org.atlassian.net/browse/ICU-20850
https://www.debian.org/security/2021/dsa-5014
https://github.com/unicode-org/icu/pull/886
https://lists.debian.org/debian-lts-announce/2021/10/msg00008.html
https://unicode-org.atlassian.net/browse/ICU-20850
https://www.debian.org/security/2021/dsa-5014
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

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