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CVE-2020-7070

PHP parses encoded cookie names so malicious `__Host-` cookies can be sent

MEDIUM
5.3
CVSS Score
Published: October 2, 2020 at 02:14 PM UTC
Updated: June 17, 2026 at 03:24 AM UTC
7 products affected across 7 vendorsDebian LinuxFedoraUbuntu Linux

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Severity
MEDIUM5.3
Exploit prediction
EPSS 5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
12.0414.0416.0418.0420.04
Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
313233
Clustered Data ONTAP· NetApp
95%
All versions
Leap· openSUSEdrupal
95%
15.115.2
PHP· PHPdrupal
95%
7.2.0 ≤ v < 7.2.347.2.x ≤ v < 7.2.347.3.0 ≤ v < 7.3.237.3.x ≤ v < 7.3.237.4.0 ≤ v < 7.4.117.4.x ≤ v < 7.4.117.2.x7.3.x7.4.x
Affected range stops below 7.2.34, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.3.23, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.11, so it looks safe — our inference, not a vendor statement
Tenable.Sc· Tenabledrupal
95%
v < 5.19.0
Affected range stops below 5.19.0, so it looks safe — our inference, not a vendor statement

References (15)

x_refsource_MISCThird Party Advisory
Source: [email protected]
http://cve.circl.lu/cve/CVE-2020-8184
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00045.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00067.html
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://bugs.php.net/bug.php?id=79699
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/895727
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/10/msg00008.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EVDN7D3IB4EAI4D3ZOM2OJKQ5SD7K4E/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2J3ZZDHCSX65T5QWV4AHBN7MOJXBEKG/

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-565

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