Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2020-13943

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
12/10/2020
Last modified:
31/01/2023

Description

If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): None
Availability (A): None

Base Score 3.x
4.30
Severity 3.x
MEDIUM
Vector 2.0
AV:N/AC:L/Au:S/C:P/I:N/A:N CVSS v2.0 Severity and Metrics:

Base Score: 4.00 MEDIUM
Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): Physical
Integrity (I): None
Availability (A): None

Base Score 2.0
4.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:apache:tomcat:8.5.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.4:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.5:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.6:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.7:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.8:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.9:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.10:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.11:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.12:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.13:*:*:*:*:*:*:*
cpe:2.3:a:apache:tomcat:8.5.14:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools