Vulnerability in Arm Mbed TLS
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.019 (79.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.019 · change: -0.001
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/ARMmbed/mbedtls/releases/tag/v2.25.0 (Third Party Advisory, Release Notes)
- github.com/ARMmbed/mbedtls/releases/tag/v2.16.9 (Third Party Advisory, Release Notes)
- github.com/ARMmbed/mbedtls/releases/tag/v2.7.18 (Third Party Advisory, Release Notes)
- cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/11/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/12/msg00036.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-36475?
- CVE-2020-36475 is a high-severity vulnerability in Arm Mbed TLS, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.5/10. Published 2021-08-23.
- How severe is CVE-2020-36475?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2020-36475 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.