If the source for resources on a page is through an FTP connection, it is possible to trigger a series of modal alert messages for these resources through invalid credentials or locations. These messages cannot be immediately dismissed, allowing for a denial of service (DOS) attack. This vulnerability affects Firefox < 66.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Apr 26, 2019 |
| Freebsd | — | Upgrade linux-thunderbirdUpgrade firefox-esrUpgrade waterfoxUpgrade libxulUpgrade firefoxUpgrade seamonkeyUpgrade linux-firefoxUpgrade linux-seamonkeyUpgrade thunderbird | Mar 20, 2019 | Mar 19, 2019 |
| Mfsa2019 07 | — | Upgrade to Mozilla Firefox version 66.0Upgrade to the latest version of Mozilla Firefox | Mar 20, 2019 | Mar 19, 2019 |
| Ubuntu | — | Upgrade firefox | Apr 1, 2019 | Mar 19, 2019 |
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