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.
Conclusion & alert: CVE-2023-34414 is rated Low Risk (32.4/100): CVSS Low severity, with medium exploitation likelihood (EPSS 0.90%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.05% | 0.90% | +0.85% |
| 2 | 2026-06-07 | 0.05% | 0.05% | +0.00% |
| 3 | 2026-04-19 | — | 0.05% | — |
Full EPSS history (11 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 3.1 | 3.1 | LOW |
|
1.6 | 1.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-34414: 3 source package rows (firefox, firefox-esr, thunderbird); 126 state rows across 6 repos (3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 8, open 118. | https://security.alpinelinux.org/vuln/CVE-2023-34414 |
debian
|
not yet assigned | CVE-2023-34414 not yet assigned priority: Debian including 3 source packages (firefox, firefox-esr, thunderbird), 11 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 11. | https://security-tracker.debian.org/tracker/CVE-2023-34414 |
gentoo
|
high | CVE-2023-34414: 2 GLSA(s) (202312-03, 202401-10), 4 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-34414 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2023-34414 |
suse
|
high | CVE-2023-34414 severity important: SUSE including 45 source package names (MozillaFirefox, MozillaFirefox-102.12.0-112.162.1, …), 203 product×package rows across 67 product lines (Container suse/kiosk/firefox-esr, Image SLES12-SP5-SAP-Azure-LI-BYOS-Production, … (67 product lines)): Fixed 200, Known Not Affected 3. | https://www.suse.com/security/cve/CVE-2023-34414/ |
ubuntu
|
medium | CVE-2023-34414 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 16 status rows across 8 suites (bionic, focal, jammy, kinetic, lunar, trusty, upstream, xenial): ignored 6, released 5, not-affected 3, needs-triage 2. | https://ubuntu.com/security/CVE-2023-34414 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | firefox | < 114.0 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | firefox_esr | < 102.12 | cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* |
| mozilla | thunderbird | < 102.12 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| 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 |