CVE-2021-23998
MEDIUMCVSS 6.5/10EPSS 0.55%
Last modified
CVE-2021-23998 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 88.0 |
| Mozilla | Firefox Esr | < 78.10 |
| Mozilla | Thunderbird | < 78.10 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667456Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/Release Notes, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667456Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/Release Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23998?
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.
How severe is CVE-2021-23998?
CVE-2021-23998 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23998?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-23998?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST