Vulnerability in Arm Mbed TLS
CVE-2020-36425
An issue was discovered in Arm Mbed TLS before 2.24.0. It incorrectly uses a revocationDate check when deciding whether to honor certificate revocation via a CRL. In some situations, an attacker can exploit this by changing the local clock.
Vulnerability class: Improper Certificate Validation
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:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.010 (60.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.001
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/v2.7.17 (Third Party Advisory, Release Notes)
- github.com/ARMmbed/mbedtls/releases/tag/v2.16.8 (Third Party Advisory, Release Notes)
- github.com/ARMmbed/mbedtls/releases/tag/v2.24.0 (Third Party Advisory, Release Notes)
- bugs.gentoo.org/740108 (Patch, Third Party Advisory, Issue Tracking)
- github.com/ARMmbed/mbedtls/pull/3433 (Third Party Advisory)
- github.com/ARMmbed/mbedtls/issues/3340 (Exploit, 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-2020-36425?
- CVE-2020-36425 is a medium-severity vulnerability in Arm Mbed TLS, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2021-07-19.
- How severe is CVE-2020-36425?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-36425 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.