Vulnerability in Arm Mbed TLS
CVE-2020-36421
An issue was discovered in Arm Mbed TLS before 2.23.0. Because of a side channel in modular exponentiation, an RSA private key used in a secure enclave could be disclosed.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.015 · change: -0.000
Affected products
- Arm Mbed TLS
- Debian Linux — versions 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/ARMmbed/mbedtls/releases/tag/v2.16.7 (Third Party Advisory, Release Notes)
- github.com/ARMmbed/mbedtls/releases/tag/v2.23.0 (Third Party Advisory, Release Notes)
- github.com/ARMmbed/mbedtls/issues/3394 (Exploit, Third Party Advisory, Issue Tracking)
- bugs.gentoo.org/730752 (Patch, Third Party Advisory, Issue Tracking)
- lists.debian.org/debian-lts-announce/2022/12/msg00036.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-36421?
- CVE-2020-36421 is a medium-severity vulnerability in Arm Mbed TLS, classified under Observable Discrepancy. CVSS score: 5.3/10. Published 2021-07-19.
- How severe is CVE-2020-36421?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-36421 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.