5.3

CVE-2022-46392: arm mbed_tls Observable Discrepancy

CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2022-46392DEBIAN-CVE-2022-46392
Published 15-12-2022Last modified 03-11-2025
Open JSON

Vulnerability summary

CVE-2022-46392 is a medium (CVSS 5.3) Observable Discrepancy vulnerability in arm mbed_tls. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 57.6% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.85%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DLA-4236-1

Timeline

  1. 15-12-2022
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. An adversary with access to precise enough information about memory accesses (typically, an untrusted operating system attacking a secure enclave) can recover an RSA private key after observing the victim performing a single private-key operation, if the window size (MBEDTLS_MPI_WINDOW_SIZE) used for the exponentiation is 3 or smaller.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.85%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

+0.07 pp

From 0.79% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.85%

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
Debian1 product
  • mbedtls< 2.28.2-1
Fedoraproject1 product
Trustedfirmware1 product
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

5 vendors · 5 products

References

9 links