CVE-2021-38506
First published: Tue Nov 02 2021(Updated: )
Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <91.3 | 91.3 |
| <94 | 94 | |
| <91.3 | 91.3 | |
| <91.3 | 91.3 | |
| Mozilla Firefox | <94.0 | |
| Mozilla Firefox ESR | <91.3.0 | |
| Mozilla Thunderbird | <91.3.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| debian/firefox | 118.0.2-1 | |
| debian/firefox-esr | 91.12.0esr-1~deb10u1 115.3.1esr-1~deb10u1 102.15.0esr-1~deb11u1 115.3.1esr-1~deb11u1 102.15.1esr-1~deb12u1 115.3.0esr-1~deb12u1 115.3.0esr-1 115.4.0esr-1 | |
| debian/thunderbird | 1:91.12.0-1~deb10u1 1:115.3.1-1~deb10u1 1:102.13.1-1~deb11u1 1:115.3.1-1~deb11u1 1:102.15.1-1~deb12u1 1:115.3.1-1~deb12u1 1:115.3.1-1 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1730750
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
- https://security.gentoo.org/glsa/202202-03
- https://security.gentoo.org/glsa/202208-14
- https://www.debian.org/security/2021/dsa-5026
- https://www.debian.org/security/2022/dsa-5034
- https://www.mozilla.org/security/advisories/mfsa2021-48/
- https://www.mozilla.org/security/advisories/mfsa2021-49/
- https://www.mozilla.org/security/advisories/mfsa2021-50/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-38506
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-38506
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-38506
- https://security-tracker.debian.org/tracker/CVE-2021-38506
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-38506.
What software is affected by this vulnerability?
This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
What is the severity of CVE-2021-38506?
The severity of CVE-2021-38506 is high.
How can this vulnerability be exploited?
This vulnerability can be exploited through a series of navigations, allowing Firefox to enter fullscreen mode without notification or warning to the user.
What is the impact of this vulnerability?
This vulnerability could lead to spoofing attacks on the browser UI, including phishing.
- collector/mozilla-advisory
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/softwarecombine
- source/Mozilla
- agent/software-canonical-lookup
- agent/weakness
- agent/author
- agent/severity
- agent/references
- agent/description
- agent/software-canonical-lookup-request
- collector/nvd-index
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/tags
- agent/event
- agent/trending
- vendor/mozilla
- canonical/mozilla firefox esr
- package-manager/debian
- canonical/mozilla thunderbird
- canonical/mozilla firefox
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- version/debian debian linux/11.0