CVE-2017-7814

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

File downloads encoded with "blob:" and "data:" URL elements bypassed normal file download checks though the Phishing and Malware Protection feature and its block lists of suspicious sites and files. This would allow malicious sites to lure users into downloading executables that would otherwise be detected as suspicious. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

Metrics

CVSS 3.0 7.8/10CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

VendorProductVersions
MozillaFirefox>= unspecified, < 56
MozillaFirefox ESR>= unspecified, < 52.4
MozillaThunderbird>= unspecified, < 52.4

References

Timeline

Published
Jun 11, 2018
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2017

CVE-2017-78155.3On pages containing an iframe, the "data:" protocol can be used to create a modal dialog through Javascript that will have an arbitrary domaCVE-2017-78165.3WebExtensions could use popups and panels in the extension UI to load an "about:" privileged URL, violating security checks that disallow thCVE-2017-78175.3A spoofing vulnerability can occur when a page switches to fullscreen mode without user notification, allowing a fake address bar to be dispCVE-2017-78189.8A use-after-free vulnerability can occur when manipulating arrays of Accessible Rich Internet Applications (ARIA) elements within containersCVE-2017-78199.8A use-after-free vulnerability can occur in design mode when image objects are resized if objects referenced during the resizing have been fCVE-2017-78205.3The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web CVE-2017-78219.8A vulnerability where WebExtensions can download and attempt to open a file of some non-executable file types. This can be triggered withoutCVE-2017-78225.3The AES-GCM implementation in WebCrypto API accepts 0-length IV when it should require a length of 1 according to the NIST Special PublicatiCVE-2017-78235.4The content security policy (CSP) "sandbox" directive did not create a unique origin for the document, causing it to behave as if the "allowCVE-2017-78249.8A buffer overflow occurs when drawing and validating elements with the ANGLE graphics library, used for WebGL content. This is due to an incCVE-2017-78255.3Several fonts on OS X display some Tibetan and Arabic characters as whitespace. When used in the addressbar as part of an IDN this can be usCVE-2017-78269.8Memory safety bugs were reported in Firefox 56 and Firefox ESR 52.4. Some of these bugs showed evidence of memory corruption and we presume
CVE-2017-7814: High severity, CVSS 7.8 | Vulnix