Is CVE-2021-45450 in the CISA KEV catalog?

No. CVE-2021-45450 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-45450?

CVE-2021-45450 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-45450?

CVE-2021-45450 has an EPSS score of 1.13% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-45450?

Upgrade mbed tls to 2.28.0 or later.

CVE & CISA-KEV Catalog

CVE-2021-45450

HIGH

7.5

CVSS v3

NVD

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.

CWE-327

How to fix

Remediation Available

mbed tlsNVD

Affected:>= 2.22.0, < 2.28.0Fixed in:2.28.0CVE-2021-45450derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.13%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Third-Party Advisory3

Mailing List2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-05.