CVE-2019-11763

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities

published January 8, 2020

CVSS
—
EPSS
1%
Percentile
66.5
In the wild
Unconfirmed
What it is

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01148 · 66.5th percentile
Published
2020-01-08T19:59Z
EPSS history
Timeline
  • 08 JAN 19:59Z
    Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities
    cvelistv5