Vulnerability Details : CVE-2020-36475
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.
Vulnerability category: Denial of service
Products affected by CVE-2020-36475
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:logo\!_cmr2020_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:logo\!_cmr2040_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_rtu3031c_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_rtu3041c_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_rtu3030c_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_rtu3000c_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
- cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-36475
0.66%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 80 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-36475
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2020-36475
-
The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-36475
-
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
[SECURITY] [DLA 3249-1] mbedtls security updateMailing List;Third Party Advisory
-
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
Release Mbed TLS 2.25.0 · ARMmbed/mbedtls · GitHubRelease Notes;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html
[SECURITY] [DLA 2826-1] mbedtls security updateMailing List;Third Party Advisory
-
https://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf
Patch;Third Party Advisory
-
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
Release Mbed TLS 2.16.9 · ARMmbed/mbedtls · GitHubRelease Notes;Third Party Advisory
-
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
Release Mbed TLS 2.7.18 · ARMmbed/mbedtls · GitHubRelease Notes;Third Party Advisory
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