Description
In PHP versions 7.2.x below 7.2.34, 7.3.x below 7.3.23 and 7.4.x below 7.4.11, when PHP is processing incoming HTTP cookie values, the cookie names are url-decoded. This may lead to cookies with prefixes like __Host confused with cookies that decode to such prefix, thus leading to an attacker being able to forge cookie which is supposed to be secure. See also CVE-2020-8184 for more information.
References (15)
Scores
CVSS v3
4.3
EPSS
0.2765
EPSS Percentile
96.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Details
CWE
CWE-20
CWE-565
Status
published
Products (15)
canonical/ubuntu_linux
12.04
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
canonical/ubuntu_linux
20.04
debian/debian_linux
9.0
debian/debian_linux
10.0
fedoraproject/fedora
31
fedoraproject/fedora
32
fedoraproject/fedora
33
... and 5 more
Published
Oct 02, 2020
Tracked Since
Feb 18, 2026