Medium severity4.3NVD Advisory· Published Jun 24, 2025· Updated Apr 13, 2026
CVE-2025-6434
CVE-2025-6434
Description
The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked an anti-clickjacking delay, potentially allowing an attacker to trick a user into granting an exception and loading a webpage over HTTP. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
71cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <140.0
- (no CPE)range: <140
- Range: <140
- osv-coords68 versionspkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox-branding-SLE&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Enterprise%20Storage%207.1pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP6pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP7pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%207.1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP6pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP7pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP6pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7pkg:rpm/suse/pipewire&distro=SUSE%20Enterprise%20Storage%207.1pkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP6pkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3pkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/pipewire&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Enterprise%20Storage%207.1pkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3pkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/xdg-desktop-portal&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5
< 140.1.0-1.1+ 67 more
- (no CPE)range: < 140.1.0-1.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.0.2-1.1
- (no CPE)range: < 140.1.0-150200.8.230.1
- (no CPE)range: < 140.1.0-1.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-35.19.5
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-150200.9.21.1
- (no CPE)range: < 140-35.19.5
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.0-112.270.2
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.1.0-150200.152.193.1
- (no CPE)range: < 140.0-112.270.2
- (no CPE)range: < 140.1.0-150200.8.230.1
- (no CPE)range: < 140.1.0-150200.8.230.1
- (no CPE)range: < 140.1.0-150200.8.230.1
- (no CPE)range: < 140.1.0-150200.8.230.1
- (no CPE)range: < 0.3.24-150300.4.8.1
- (no CPE)range: < 0.3.24-150300.4.8.1
- (no CPE)range: < 0.3.49-150400.3.7.1
- (no CPE)range: < 0.3.49-150400.3.7.1
- (no CPE)range: < 0.3.64-150500.3.7.2
- (no CPE)range: < 0.3.64-150500.3.7.2
- (no CPE)range: < 0.3.6-150200.3.11.1
- (no CPE)range: < 0.3.6-150200.3.11.1
- (no CPE)range: < 0.3.24-150300.4.8.1
- (no CPE)range: < 0.3.49-150400.3.7.1
- (no CPE)range: < 0.3.64-150500.3.7.2
- (no CPE)range: < 0.3.24-150300.4.8.1
- (no CPE)range: < 0.3.49-150400.3.7.1
- (no CPE)range: < 0.3.64-150500.3.7.2
- (no CPE)range: < 1.8.0-150200.5.8.1
- (no CPE)range: < 1.8.0-150200.5.8.1
- (no CPE)range: < 1.10.1-150400.3.8.1
- (no CPE)range: < 1.10.1-150400.3.8.1
- (no CPE)range: < 1.16.0-150500.3.8.1
- (no CPE)range: < 1.16.0-150500.3.8.1
- (no CPE)range: < 1.8.0-150200.5.8.1
- (no CPE)range: < 1.10.1-150400.3.8.1
- (no CPE)range: < 1.16.0-150500.3.8.1
- (no CPE)range: < 1.8.0-150200.5.8.1
- (no CPE)range: < 1.10.1-150400.3.8.1
- (no CPE)range: < 1.16.0-150500.3.8.1
Patches
Vulnerability mechanics
References
3- www.mozilla.org/security/advisories/mfsa2025-51/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- www.mozilla.org/security/advisories/mfsa2025-54/nvd
News mentions
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