If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2021-22/#CVE-2021-29957
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2021:2262 https://access.redhat.com/errata/RHSA-2021:2262
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.2 Extended Update Support Via RHSA-2021:2261 https://access.redhat.com/errata/RHSA-2021:2261
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2021:2263 https://access.redhat.com/errata/RHSA-2021:2263
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:2264 https://access.redhat.com/errata/RHSA-2021:2264
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-29957