A scilab security update has been released for Debian GNU/Linux 9 LTS to address multiple issues.

DLA 2705-1: scilab security update

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Debian LTS Advisory DLA-2705-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
July 07, 2021   https://wiki.debian.org/LTS
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Package : scilab
Version : 5.5.2-4+deb9u1
CVE ID : CVE-2021-30485 CVE-2021-31229 CVE-2021-31347 CVE-2021-31348
CVE-2021-31598

Multiple issues have been discovered in scilab, particularly in ezXML embedded library:

CVE-2021-30485

Descriptionincorrect memory handling, leading to a NULL pointer dereference
in ezxml_internal_dtd()

CVE-2021-31229

Out-of-bounds write in ezxml_internal_dtd() leading to out-of-bounds write
of a one byte constant

CVE-2021-31347, CVE-2021-31348

incorrect memory handling in ezxml_parse_str() leading to out-of-bounds read

CVE-2021-31598

Out-of-bounds write in ezxml_decode() leading to heap corruption

For Debian 9 stretch, these problems have been fixed in version
5.5.2-4+deb9u1.

We recommend that you upgrade your scilab packages.

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

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