Mozilla Firefox/Thunderbird/Firefox ESR URI escape output

Summaryinfo

A vulnerability categorized as critical has been discovered in Mozilla Firefox, Thunderbird and Firefox ESR. The affected element is an unknown function of the component URI Handler. Executing a manipulation can lead to input validation. This vulnerability is handled as CVE-2019-11717. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Mozilla Firefox, Thunderbird and Firefox ESR (Web Browser) (affected version unknown) and classified as critical. This vulnerability affects an unknown functionality of the component URI Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability exists where the caret ("^") character is improperly escaped constructing some URIs due to it being used as a separator, allowing for possible spoofing of origin attributes. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

The weakness was released 07/23/2019 (Website). The advisory is shared for download at security.gentoo.org. This vulnerability was named CVE-2019-11717 since 05/03/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/26/2025).

Upgrading eliminates this vulnerability.

Entries connected to this vulnerability are available at VDB-138488, VDB-138489, VDB-138490 and VDB-138491. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox
• Firefox ESR
• Thunderbird

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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