Using iterative requests an attacker was able to learn the size of an opaque response, as well as the contents of a server-supplied Vary header. This vulnerability affects Firefox < 119.
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "firefox",
"binary_version": "119.0+build2-0ubuntu0.20.04.1"
},
{
"binary_name": "firefox-dev",
"binary_version": "119.0+build2-0ubuntu0.20.04.1"
},
{
"binary_name": "firefox-geckodriver",
"binary_version": "119.0+build2-0ubuntu0.20.04.1"
},
{
"binary_name": "firefox-mozsymbols",
"binary_version": "119.0+build2-0ubuntu0.20.04.1"
}
]
}