A ca-certificates update has been released for Debian GNU/Linux 9 LTS to whitelist Symantec CA.

DLA 2593-1: ca-certificates whitelist Symantec CA

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Debian LTS Advisory DLA-2593-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 14, 2021   https://wiki.debian.org/LTS
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Package : ca-certificates
Version : 20200601~deb9u2
Debian Bug : 962596

This update reverts the Symantec CA blacklist (which was originally
#911289). The following root certificates were added back (+):
+ "GeoTrust Global CA"
+ "GeoTrust Primary Certification Authority"
+ "GeoTrust Primary Certification Authority - G2"
+ "GeoTrust Primary Certification Authority - G3"
+ "GeoTrust Universal CA"
+ "thawte Primary Root CA"
+ "thawte Primary Root CA - G2"
+ "thawte Primary Root CA - G3"
+ "VeriSign Class 3 Public Primary Certification Authority - G4"
+ "VeriSign Class 3 Public Primary Certification Authority - G5"
+ "VeriSign Universal Root Certification Authority"

NOTE: due to bug #743339, CA certificates added back in this version
won't automatically be trusted again on upgrade. Affected users may
need to reconfigure the package to restore the desired state.

For Debian 9 stretch, this problem has been fixed in version
20200601~deb9u2.

We recommend that you upgrade your ca-certificates packages.

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

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