CVE-2021-45450

Name: CVE-2021-45450
Creator: NVD / NIST
Published: 2021-12-21T07:15:06.727+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.13%

Last modified Jun 17, 2026

CVE-2021-45450 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.13%

62.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Trustedfirmware	Mbed Tls	>= 2.22.0, < 2.28.0
Trustedfirmware	Mbed Tls	3.0.0
Fedoraproject	Fedora	36
Fedoraproject	Fedora	37

References

https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0Release Notes, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0Release Notes, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IL66WKJGXY5AXMTFE7QDMGL3RIBD6PX5/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TALJHOYAYSUJTLN6BYGLO4YJGNZUY74W/Mailing List
https://security.gentoo.org/glsa/202301-08Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0Release Notes, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0Release Notes, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IL66WKJGXY5AXMTFE7QDMGL3RIBD6PX5/Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TALJHOYAYSUJTLN6BYGLO4YJGNZUY74W/Mailing List
https://security.gentoo.org/glsa/202301-08Third Party Advisory

Timeline

Published: Dec 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-45450?

How severe is CVE-2021-45450?

CVE-2021-45450 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.

How do I fix CVE-2021-45450?

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.

Are you affected by CVE-2021-45450?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST