CVE-2021-23998 Security feature bypass in Firefox
Attackers can spoof secure lock icons in Firefox and Thunderbird via complex window navigation, misleading users about connection security.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-23998?
CVE-2021-23998 is a medium-severity vulnerability in Mozilla Firefox, published on 24 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Through complicated navigations with new windows, an HTTP page could have inherited a secure lock icon from an HTTPS page. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
Weakness: CWE-345
Which versions are affected by CVE-2021-23998?
It affects 3 products.
Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2021-23998?
Upgrade to a fixed version.
Is CVE-2021-23998 being exploited?
There is no known exploitation of CVE-2021-23998 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2021-23998, GHSA-5pc3-x247-jxch, UBUNTU-CVE-2021-23998.