CVE-2020-36421
MEDIUMCVSS 5.3/10EPSS 1.58%
Last modified
CVE-2020-36421 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 1.58% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Arm | Mbed Tls | < 2.16.7 |
| Arm | Mbed Tls | >= 2.17.0, < 2.23.0 |
| Debian | Debian Linux | 10.0 |
References
- https://bugs.gentoo.org/730752Issue Tracking, Patch, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/issues/3394Exploit, Issue Tracking, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.7Release Notes, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.23.0Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
- https://bugs.gentoo.org/730752Issue Tracking, Patch, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/issues/3394Exploit, Issue Tracking, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.7Release Notes, Third Party Advisory
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.23.0Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2020-36421?
CVE-2020-36421 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.58% probability of exploitation in the next 30 days.
How do I fix CVE-2020-36421?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-36421?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST