A wpa security update has been released for Debian GNU/Linux 9 LTS to address a buffer over-write.

DLA 2572-1: wpa security update

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Debian LTS Advisory DLA-2572-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
February 20, 2021   https://wiki.debian.org/LTS
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Package : wpa
Version : 2:2.4-1+deb9u8
CVE ID : CVE-2021-0326

An issue has been found in wpa, a set of tools to support WPA and WPA2
(IEEE 802.11i).
Missing validation of data can result in a buffer over-write, which might
lead to a DoS of the wpa_supplicant process or potentially arbitrary code
execution.

On request, together with this upload support for WPA-EAP-SUITE-B(-192)
has been enabled.

For Debian 9 stretch, this problem has been fixed in version
2:2.4-1+deb9u8.

We recommend that you upgrade your wpa packages.

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

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