What’s Vulnerable › Vulnerabilities

CVE-2021-43666

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-24 · updated 2026-06-17
• Weakness: CWE-130

Description

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.

Affected products

• mbedtls: through 3.0.0
• Debian Linux: 10.0

References

• https://github.com/ARMmbed/mbedtls/issues/5136
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
• https://github.com/ARMmbed/mbedtls/issues/5136
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
• https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html

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