What’s Vulnerable › Vulnerabilities

CVE-2021-45450

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-21 · updated 2026-06-17
• Weakness: CWE-327

Description

In Mbed TLS before 2.28.0 and 3.x before 3.1.0, psa_cipher_generate_iv and psa_cipher_encrypt allow policy bypass or oracle-based decryption when the output buffer is at memory locations accessible to an untrusted application.

Affected products

• Fedoraproject Fedora: 36, 37
• TrustedFirmware Mbed TLS: from 2.22.0 before 2.28.0; 3.0.0 — fixed in 2.28.0

How to fix

Upgrade to a fixed version: TrustedFirmware Mbed TLS 2.28.0. Check the vendor advisory for mitigations.

References

• https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0
• https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IL66WKJGXY5AXMTFE7QDMGL3RIBD6PX5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TALJHOYAYSUJTLN6BYGLO4YJGNZUY74W/
• https://security.gentoo.org/glsa/202301-08
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0
• https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IL66WKJGXY5AXMTFE7QDMGL3RIBD6PX5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TALJHOYAYSUJTLN6BYGLO4YJGNZUY74W/
• https://security.gentoo.org/glsa/202301-08

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