An apache-log4j1.2 security update has been released for both Debian GNU/Linux 9 and 10 to address an issue where an attacker can execute arbitrary code in the context of the logger application.

DSA 4686-1: apache-log4j1.2 security update

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Debian Security Advisory DSA-4686-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
May 16, 2020   https://www.debian.org/security/faq
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Package : apache-log4j1.2
CVE ID : CVE-2019-17571
Debian Bug : 947124

It was discovered that the SocketServer class included in
apache-log4j1.2, a logging library for java, is vulnerable to
deserialization of untrusted data. An attacker can take advantage of
this flaw to execute arbitrary code in the context of the logger
application by sending a specially crafted log event.

For the oldstable distribution (stretch), this problem has been fixed
in version 1.2.17-7+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 1.2.17-8+deb10u1.

We recommend that you upgrade your apache-log4j1.2 packages.

For the detailed security status of apache-log4j1.2 please refer to its
security tracker page at:
  https://security-tracker.debian.org/tracker/apache-log4j1.2

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/