Medium severity4.3NVD Advisory· Published Feb 26, 2021· Updated Jun 17, 2026

CVE-2021-23968

Description

If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. This could be used to leak sensitive information contained in such URIs. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Mozilla Corporation/Firefox5 versions
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <86.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.8
- (no CPE)range: <86
- (no CPE)range: < 78.8
- (no CPE)range: < 86
Mozilla Corporation/Thunderbird3 versions
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.8
- (no CPE)range: <78.8
- (no CPE)range: < 78.8
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
osv-coords34 versions
pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2 pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2 pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed pkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCL pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCL pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCL pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Proxy%204.0 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Server%204.0 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%209 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209 pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2
< 78.8.0-lp152.2.49.1+ 33 more
- (no CPE)range: < 78.8.0-lp152.2.49.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.8.0-lp152.2.35.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-8.32.2
- (no CPE)range: < 78.8.0-78.120.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-8.15.4

Patches

Vulnerability mechanics

References

bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
lists.debian.org/debian-lts-announce/2021/03/msg00000.htmlnvdMailing ListThird Party Advisory
security.gentoo.org/glsa/202104-09nvdThird Party Advisory
security.gentoo.org/glsa/202104-10nvdThird Party Advisory
www.debian.org/security/2021/dsa-4866nvdThird Party Advisory
www.mozilla.org/security/advisories/mfsa2021-07/nvdRelease NotesVendor Advisory
www.mozilla.org/security/advisories/mfsa2021-08/nvdRelease NotesVendor Advisory
www.mozilla.org/security/advisories/mfsa2021-09/nvdRelease NotesVendor Advisory

News mentions

No linked articles in our index yet.

cvss	0.280
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000