Cleartext Transmission of Sensitive Information Affecting Firefox package, versions [,139)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-UNMANAGED-FIREFOX-10301396
- published4 Jun 2025
- disclosed27 May 2025
- creditxiulou
Introduced: 27 May 2025
NewCVE-2025-5270 (opens in a new tab)How to fix?
Upgrade Firefox to version 139 or higher.
Overview
Affected versions of this package are vulnerable to Cleartext Transmission of Sensitive Information due to the improper handling of the SNI field. An attacker can intercept and read the SNI information by exploiting the lack of encryption even when encrypted DNS is enabled.