CVE catalog
CVE-2020-36478
mbedtls: CVE-2020-36478
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.10% · Oct 27, 2026
An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | mbedtls | sid | 3.6.7-3 | fixed |
| Debian | mbedtls | forky | 3.6.7-3 | fixed |
| Debian | mbedtls | trixie | 3.6.6-0.1~deb13u1 | fixed |
| Debian | mbedtls | bookworm | 2.28.3-1 | fixed |
| Ubuntu | mbedtls | 16.04 | 2.1.2-1 | vulnerable |
| Ubuntu | mbedtls | 16.04 | 2.2.0-1 | vulnerable |
| Ubuntu | mbedtls | 16.04 | 2.2.1-1 | vulnerable |
| Ubuntu | mbedtls | 16.04 | 2.2.1-2 | vulnerable |
| Ubuntu | mbedtls | 16.04 | 2.2.1-2ubuntu0.1 | vulnerable |
| Ubuntu | mbedtls | 16.04 | 2.2.1-2ubuntu0.2 | vulnerable |
| Ubuntu | mbedtls | 16.04 | 2.2.1-2ubuntu0.3 | vulnerable |
| Ubuntu | mbedtls | pro | 2.16.2-1 | vulnerable |
| Ubuntu | mbedtls | pro | 2.16.3-1 | vulnerable |
| Ubuntu | mbedtls | pro | 2.16.4-1ubuntu2 | vulnerable |
| Ubuntu | mbedtls | pro | 2.16.4-1ubuntu2+esm1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mbedtls | source | sid | 2.16.9-0.1 | not yet assigned | Not reported | Not reported |
| Debian | mbedtls | source | forky | 2.16.9-0.1 | not yet assigned | Not reported | Not reported |
| Debian | mbedtls | source | trixie | 2.16.9-0.1 | not yet assigned | Not reported | Not reported |
| Debian | mbedtls | source | bookworm | 2.16.9-0.1 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmbedcrypto7]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedtls14]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedtls-dev]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedtls-doc]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· all · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· all · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedx509-1]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
[Debian 13 (Trixie)]
- [libmbedcrypto16]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
- [libmbedtls21]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
- [libmbedtls-dev]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
- [libmbedtls-doc]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· all · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· all · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
- [libmbedx509-7]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.16.9-0.1dsa · mbedtls · debian · 13
Observed:
References
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-36478]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-36478]
- [https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-257-20.json]
- [https://security-tracker.debian.org/tracker/CVE-2020-36478]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-36478.json]
[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]