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Vulnerability record · CVE-2023-34414 · published 19 June 2023

CVE-2023-34414: Mozilla firefox improper certificate validation vulnerability

Mozilla · Firefox

The error page for sites with invalid TLS certificates was missing the activation-delay Firefox uses to protect prompts and permission dialogs from attacks that exploit human response time delays. If a malicious page elicited user clicks in precise locations immediately before navigating to a site with a certificate error and made the renderer extremely busy at the same time, it could create a gap between when the error page was loaded and when the display actually refreshed. With the right timing the elicited clicks could land in that gap and activate the button that overrides the certificate error for that site. This vulnerability affects Firefox ESR < 102.12, Firefox < 114, and Thunderbird < 102.12.

3.1 CVSS 3.1 Low EPSS 0.90% · top 42.0% CWE-295 · Improper certificate validation
3.1CVSS 3.1 base score
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

The error page for sites with invalid TLS certificates was missing the activation-delay Firefox uses to protect prompts and permission dialogs from attacks that exploit human response time delays. If a malicious page elicited user clicks in precise locations immediately before navigating to a site with a certificate error and made the renderer extremely busy at the same time, it could create a gap between when the error page was loaded and when the display actually refreshed. With the right timing the elicited clicks could land in that gap and activate the button that overrides the certificate error for that site. This vulnerability affects Firefox ESR < 102.12, Firefox < 114, and Thunderbird < 102.12.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1695986 Permissions Required
https://security.gentoo.org/glsa/202312-03
https://security.gentoo.org/glsa/202401-10
https://www.mozilla.org/security/advisories/mfsa2023-19/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-20/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-21/ Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1695986 Permissions Required
https://security.gentoo.org/glsa/202312-03
https://security.gentoo.org/glsa/202401-10
https://www.mozilla.org/security/advisories/mfsa2023-19/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-20/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-21/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-34414), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.