Description
During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected and evaluated within the encrypted session. This vulnerability affects Thunderbird < 78.7.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 78.7 | 78.7 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | thunderbird | 1:78.7.0-1 | — |
| Debian 13 | thunderbird | 1:78.7.0-1 | — |
| Debian 12 | thunderbird | 1:78.7.0-1 | — |
| Debian 10 | thunderbird | 1:78.7.0-1~deb10u1 | DSA-4842-1 |
| Debian 9 | thunderbird | 1:78.7.0-1~deb9u1 | DLA-2541-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | thunderbird | 1:78.7.1+build1-0ubuntu0.20.04.1 | — |
| Ubuntu 18.04 LTS | thunderbird | 1:78.8.1+build1-0ubuntu0.18.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | thunderbird | 78.7.0-1.el8_3 | RHSA-2021:0298 |
| RHEL 7 | thunderbird | 78.7.0-1.el7_9 | RHSA-2021:0297 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.2 EUS | thunderbird | 78.7.0-1.el8_2 | RHSA-2021:0299 |
| RHEL 8.1 EUS | thunderbird | 78.7.0-1.el8_1 | RHSA-2021:0397 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | MozillaThunderbird | 78.7.0-8.9.1 | SUSE-SU-2021:0257-1 |
| SLES 15 SP1 | MozillaThunderbird | 78.7.0-3.119.1 | SUSE-SU-2021:0245-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Leap 15.2 | MozillaThunderbird | 78.7.0-lp152.2.29.1 | openSUSE-SU-2021:0209-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 78.7.0-lp151.2.69.1 | openSUSE-SU-2021:0208-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | thunderbird | 78.7.0-r0 | — |
| Alpine v3.22 | thunderbird | 78.7.0-r0 | — |
| Alpine v3.21 | thunderbird | 78.7.0-r0 | — |
| Alpine v3.20 | thunderbird | 78.7.0-r0 | — |
| Alpine v3.19 | thunderbird | 78.7.0-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | thunderbird | 78.7.0-r0 | — |
| Alpine v3.17 | thunderbird | 78.7.0-r0 | — |
| Alpine v3.16 | thunderbird | 78.7.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 78.7.0-1.amzn2 | ALAS2-2021-1603 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | thunderbird | 78.7.0-1.0.1.el8_3 | ELSA-2021-0298 |
| Oracle Linux 7 | thunderbird | 78.7.0-1.0.1.el7_9 | ELSA-2021-0297 |
Advisories 14
- RHSA-2021:0297 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-4842-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2541-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2021:0257-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0208-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0245-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2021:0397 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2021:0299 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2021:0298 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- openSUSE-SU-2021:0209-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2021-1603 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 19, 2021
- ELSA-2021-0298 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jan 29, 2021
- ELSA-2021-0297 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 29, 2021