CVE catalog
CVE-2021-43666
mbedtls: CVE-2021-43666
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 2.07% · Oct 25, 2026
A Denial of Service vulnerability exists in mbed TLS 3.0.0 and earlier in the mbedtls_pkcs12_derivation function when an input password's length is 0.
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 | 2.28.0-1 | not yet assigned | Not reported | Not reported |
| Debian | mbedtls | source | forky | 2.28.0-1 | not yet assigned | Not reported | Not reported |
| Debian | mbedtls | source | trixie | 2.28.0-1 | not yet assigned | Not reported | Not reported |
| Debian | mbedtls | source | bookworm | 2.28.0-1 | 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:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedtls14]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedtls-dev]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedtls-doc]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· all · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· all · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- [libmbedx509-1]Fixed
Source package: [mbedtls]
Details (2)
2.28.3-1· amd64 · bookwormFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
2.28.3-1· arm64 · bookwormFixed · Fixed:
2.28.0-1dsa · 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:
2.28.0-1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
- [libmbedtls21]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
- [libmbedtls-dev]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
- [libmbedtls-doc]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· all · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· all · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
- [libmbedx509-7]Fixed
Source package: [mbedtls]
Details (2)
3.6.5-0.1~deb13u1· amd64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
3.6.5-0.1~deb13u1· arm64 · trixieFixed · Fixed:
2.28.0-1dsa · mbedtls · debian · 13
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-806742.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-43666]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-43666]
- [https://security-tracker.debian.org/tracker/CVE-2021-43666]
[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]