A python2.7 security update has been released for Debian GNU/Linux 9 LTS to address two issues.

DLA 2919-1: python2.7 security update

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Debian LTS Advisory DLA-2919-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
February 12, 2022   https://wiki.debian.org/LTS
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Package : python2.7
Version : 2.7.13-2+deb9u6
CVE ID : CVE-2021-3177 CVE-2021-4189

Two issues have been discovered in python2.7:

CVE-2021-3177

Python has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may
lead to remote code execution in certain Python applications that accept
floating-point numbers as untrusted input.

CVE-2021-4189

A flaw was found in Python, specifically in the FTP (File Transfer Protocol)
client library when using it in PASV (passive) mode. The flaw lies in how
the FTP client trusts the host from PASV response by default. An attacker
could use this flaw to setup a malicious FTP server that can trick FTP
clients into connecting back to a given IP address and port. This could lead
to FTP client scanning ports which otherwise would not have been possible.
.
Instead of using the returned address, ftplib now uses the IP address we're
already connected to. For the rare user who wants an old behavior, set a
`trust_server_pasv_ipv4_address` attribute on your `ftplib.FTP` instance to
True.

For Debian 9 stretch, these problems have been fixed in version
2.7.13-2+deb9u6.

We recommend that you upgrade your python2.7 packages.

For the detailed security status of python2.7 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/python2.7

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