Description
A flaw in Thunderbird's implementation of iCal causes a stack buffer overflow in icalrecur_add_bydayrules when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 60.7.1 | 60.7.1 |
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 | 1:60.7.1-1 | — |
| Debian 13 | thunderbird | 1:60.7.1-1 | — |
| Debian 12 | thunderbird | 1:60.7.1-1 | — |
| Debian 9 | thunderbird | 1:60.7.1-1~deb9u1 | DSA-4464-1 |
| Debian 8 | thunderbird | 1:60.7.1-1~deb8u1 | DLA-1820-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | thunderbird | 1:60.7.1+build1-0ubuntu0.18.04.1 | USN-4028-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.7.1+build1-0ubuntu0.16.04.1 | USN-4028-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | thunderbird | 60.7.2-2.el8_0 | RHSA-2019:1623 |
| RHEL 7 | thunderbird | 60.7.2-2.el7_6 | RHSA-2019:1626 |
| RHEL 6 | thunderbird | 60.7.2-2.el6_10 | RHSA-2019:1624 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaThunderbird | 60.7.0-3.36.1 | SUSE-SU-2019:1683-1, SUSE-SU-2019:1495-1 |
| SLES 15 | MozillaThunderbird | 60.7.0-3.36.1 | SUSE-SU-2019:1683-1, SUSE-SU-2019:1495-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | MozillaThunderbird | 60.7.2-85.1 | openSUSE-SU-2019:1664-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 60.7.0-lp151.2.4.1 | openSUSE-SU-2019:1606-1, openSUSE-SU-2019:1583-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 60.7.0-lp151.2.4.1 | openSUSE-SU-2019:1606-1, openSUSE-SU-2019:1583-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 60.7.2-2.amzn2.0.1 | ALAS2-2019-1250 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | thunderbird | 60.7.2-2.0.1.el8_0 | ELSA-2019-1623 |
| Oracle Linux 7 | thunderbird | 60.7.2-2.0.1.el7_6 | ELSA-2019-1626 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Thunderbird ESR < 60.7.XXX - 'icalrecur_add_bydayrules' Stack-Based Buffer Overflow EDB-47004 · dos · Jun 17, 2019
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 15
- RHSA-2019:1624 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1626 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4028-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4464-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1820-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:1664-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1606-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1583-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1495-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1683-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2019:1623 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jan 14, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2019-1623 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1250 Critical: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 22, 2019
- ELSA-2019-1626 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 27, 2019