Description
If there was a PAC URL set and the server that hosts the PAC was not reachable, OCSP requests would have been blocked, resulting in incorrect error pages being shown. This vulnerability affects Firefox < 102, Firefox ESR < 91.11, Thunderbird < 102, and Thunderbird < 91.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 102 | 102 |
| Mozilla | Firefox ESR | unspecified – < 91.11 | 91.11 |
| Mozilla | Thunderbird | unspecified – < 102, unspecified – < 91.11 | 102 |
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 | firefox-esr | 91.11.0esr-1 | — |
| Debian 14 | thunderbird | 1:91.11.0-1 | — |
| Debian 13 | firefox-esr | 91.11.0esr-1 | — |
| Debian 13 | thunderbird | 1:91.11.0-1 | — |
| Debian 12 | firefox-esr | 91.11.0esr-1 | — |
| Debian 12 | thunderbird | 1:91.11.0-1 | — |
| Debian 11 | firefox-esr | 91.11.0esr-1~deb11u1 | DSA-5172-1 |
| Debian 11 | thunderbird | 1:91.11.0-1~deb11u1 | DSA-5175-1 |
| Debian 10 | firefox-esr | 91.11.0esr-1~deb10u1 | DSA-5172-1 |
| Debian 10 | thunderbird | 1:91.11.0-1~deb10u1 | DSA-5175-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 9 | firefox-esr | 91.11.0esr-1~deb9u1 | DLA-3064-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | thunderbird | 1:91.11.0+build2-0ubuntu0.22.04.1 | USN-5512-1 |
| Ubuntu 20.04 LTS | firefox | 102.0+build2-0ubuntu0.20.04.1 | USN-5504-1 |
| Ubuntu 20.04 LTS | thunderbird | 1:91.11.0+build2-0ubuntu0.20.04.1 | USN-5512-1 |
| Ubuntu 18.04 LTS | firefox | 102.0+build2-0ubuntu0.18.04.1 | USN-5504-1 |
| Ubuntu 18.04 LTS | thunderbird | 1:91.11.0+build2-0ubuntu0.18.04.1 | USN-5512-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +1 | 91.11.0-2.el9_0 | RHSA-2022:5482, RHSA-2022:5481 |
| RHEL 8 | firefox +1 | 91.11.0-2.el8_6 | RHSA-2022:5470, RHSA-2022:5469 |
| RHEL 7 | firefox +1 | 91.11.0-2.el7_9 | RHSA-2022:5480, RHSA-2022:5479 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.4 EUS | firefox +1 | 91.11.0-2.el8_4 | RHSA-2022:5473, RHSA-2022:5472 |
| RHEL 8.2 EUS | firefox +1 | 91.11.0-2.el8_2 | RHSA-2022:5475, RHSA-2022:5474 |
| RHEL 8.1 E4S | firefox +1 | 91.11.0-2.el8_1 | RHSA-2022:5478, RHSA-2022:5477 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | thunderbird | 91.11.0-2.el9_0.alma | ALSA-2022:5482 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox +1 | 91.11.0-2.el8_6 | RLSA-2022:5470, RLSA-2022:5469 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SLES 15 SP4 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SLES 15 SP4 | MozillaThunderbird | 91.11.0-150200.8.76.1 | SUSE-SU-2022:3281-1, SUSE-SU-2022:2320-1 |
| SLES 15 SP3 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SLES 15 SP3 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SLES 15 SP3 | MozillaThunderbird | 91.11.0-150200.8.76.1 | SUSE-SU-2022:3281-1, SUSE-SU-2022:2320-1 |
| SLES 15 SP2 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SLES 15 SP2 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SLES 15 SP1 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SLES 15 SP1 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
| SLES 15 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SLES 15 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
Show 23 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SLES 12 SP4 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SLES 12 SP4 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SLES 12 SP3 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SLES 12 SP3 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SLES 12 SP2 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SLES for SAP 15 SP2 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SLES for SAP 15 SP1 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
| SLES for SAP 15 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SLES for SAP 15 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SLES for SAP 12 SP5 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SLES for SAP 12 SP4 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:2289-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SLE HPC 15 SP2 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SLE HPC 15 SP1 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
| SLE HPC 15 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SLE HPC 15 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:2289-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:3273-1, SUSE-SU-2022:2289-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox-branding-SLE | 102-35.9.1 | SUSE-SU-2022:3273-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:2289-1 |
| SUSE Manager Server 4.1 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SUSE Manager Server 4.1 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SUSE Manager Retail Branch Server 4.1 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SUSE Manager Retail Branch Server 4.1 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SUSE Manager Proxy 4.1 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SUSE Manager Proxy 4.1 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 91.11.0-112.119.1 | SUSE-SU-2022:2289-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| SUSE Enterprise Storage 7 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| SUSE Enterprise Storage 6 | MozillaFirefox | 91.11.0-150000.150.47.1 | SUSE-SU-2022:3272-1, SUSE-SU-2022:2279-1 |
| SUSE Enterprise Storage 6 | MozillaFirefox-branding-SLE | 102-150000.4.22.1 | SUSE-SU-2022:3272-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 102.0.1-1.1 | openSUSE-SU-2024:12184-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.11.0-1.1 | openSUSE-SU-2024:12161-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| openSUSE Leap 15.4 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 91.11.0-150200.8.76.1 | SUSE-SU-2022:3281-1, SUSE-SU-2022:2320-1 |
| openSUSE Leap 15.3 | MozillaFirefox | 91.11.0-150200.152.48.1 | SUSE-SU-2022:3396-1, SUSE-SU-2022:2313-1 |
| openSUSE Leap 15.3 | MozillaFirefox-branding-SLE | 102-150200.9.10.1 | SUSE-SU-2022:3396-1 |
| openSUSE Leap 15.3 | MozillaThunderbird | 91.11.0-150200.8.76.1 | SUSE-SU-2022:3281-1, SUSE-SU-2022:2320-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 102.0-r0 | — |
| Alpine v3.23 | firefox +2 | 102.0-r0 | — |
| Alpine v3.23 | firefox-esr | 91.11.0-r0 | — |
| Alpine v3.22 | firefox +2 | 102.0-r0 | — |
| Alpine v3.22 | firefox-esr | 91.11.0-r0 | — |
| Alpine v3.21 | firefox +2 | 102.0-r0 | — |
| Alpine v3.21 | firefox-esr | 91.11.0-r0 | — |
| Alpine v3.20 | firefox +1 | 102.0-r0 | — |
| Alpine v3.20 | firefox-esr | 91.11.0-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox +1 | 102.0-r0 | — |
| Alpine v3.19 | firefox-esr | 91.11.0-r0 | — |
| Alpine v3.18 | firefox +1 | 102.0-r0 | — |
| Alpine v3.18 | firefox-esr | 91.11.0-r0 | — |
| Alpine v3.17 | firefox +1 | 102.0-r0 | — |
| Alpine v3.17 | firefox-esr | 91.11.0-r0 | — |
| Alpine v3.16 | firefox-esr +1 | 91.11.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 102.7.1-1.amzn2.0.1 | ALAS2-2023-1951 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +1 | 91.11.0-2.0.1.el9_0 | ELSA-2022-5482, ELSA-2022-5481 |
| Oracle Linux 8 | firefox +1 | 91.11.0-2.0.1.el8_6 | ELSA-2022-5470, ELSA-2022-5469 |
| Oracle Linux 7 | firefox +1 | 91.11.0-2.0.1.el7_9 | ELSA-2022-5480, ELSA-2022-5479 |
Advisories 39
- ALSA-2022:5482 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2022:5479 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2022:5480 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-5512-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-5504-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5172-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5175-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3064-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:5470 Important: thunderbird security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2022:5469 Important: firefox security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:12161-1 MozillaThunderbird-91.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3273-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3396-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12184-1 MozillaFirefox-102.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2289-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2279-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3281-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2320-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3272-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2313-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2022:5481 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5482 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5478 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5477 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5475 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5473 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5474 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5472 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5470 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2022:5469 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ALAS2-2023-1951 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 30, 2025
- WID-SEC-2022-0505 Mozilla Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 27, 2023
- ELSA-2022-5482 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 2, 2022
- ELSA-2022-5481 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 2, 2022
- ELSA-2022-5470 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 1, 2022
- ELSA-2022-5469 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 1, 2022
- ELSA-2022-5479 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 1, 2022
- ELSA-2022-5480 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 1, 2022