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

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CVE-2020-36475

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
23/08/2021
Last modified:
11/01/2023

Description

An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). The calculations performed by mbedtls_mpi_exp_mod are not limited; thus, supplying overly large parameters could lead to denial of service when generating Diffie-Hellman key pairs.

Impact

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

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

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

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* 2.7.18 (excluding)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* 2.8.0 (including) 2.16.9 (excluding)
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:* 2.17.0 (including) 2.25.0 (excluding)
cpe:2.3:o:siemens:logo\!_cmr2020_firmware:*:*:*:*:*:*:*:* 2.2 (excluding)
cpe:2.3:h:siemens:logo\!_cmr2020:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:logo\!_cmr2040_firmware:*:*:*:*:*:*:*:* 2.2 (excluding)
cpe:2.3:h:siemens:logo\!_cmr2040:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3031c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3031c:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3041c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3041c:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3030c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3030c:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_rtu3000c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_rtu3000c:-:*:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools