system
Provide references for <CVE-2020-21913>.
user
Where can I find more information about <CVE-2020-21913>?
assistant
References are available at: https://unicode-org.atlassian.net/browse/ICU-20850, https://github.com/unicode-org/icu/pull/886, https://lists.debian.org/debian-lts-announce/2021/10/msg00008.html, https://www.debian.org/security/2021/dsa-5014.