7.5

CVE-2021-45451: arm mbed_tls

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-45451
Published 21-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-45451 is a high (CVSS 7.5) vulnerability in arm mbed_tls. EPSS estimates a 0.95% chance of exploitation in the next 30 days, higher than 60.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.95%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-12-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In Mbed TLS before 3.1.0, psa_aead_generate_nonce allows policy bypass or oracle-based decryption when the output buffer is at memory locations accessible to an untrusted application.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.95%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

+0.03 pp

From 0.92% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.95%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Arm1 product
Fedoraproject1 product
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

3 vendors · 3 products

References

5 links