4.7

CVE-2020-36424: arm mbed_tls Observable Discrepancy

CVSS: 4.7v3.1MediumModified
AliasesUBUNTU-CVE-2020-36424DEBIAN-CVE-2020-36424
Published 19-07-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-36424 is a medium (CVSS 4.7) Observable Discrepancy vulnerability in arm mbed_tls. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.1% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.7/10
010
Medium · v3.1 (NVD)
EPSS score
0.35%
0%100%
Low · 0.00 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-3249-1

Timeline

  1. 19-07-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Arm Mbed TLS before 2.24.0. An attacker can recover a private key (for RSA or static Diffie-Hellman) via a side-channel attack against generation of base blinding/unblinding values.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

0.00 pp

From 0.35% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.35%

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

Debian2 products
Arm1 product
  • mbed_tls< 2.7.17 | ≥ 2.8.0, < 2.16.8 | ≥ 2.17.0, < 2.24.0
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

3 vendors · 4 products

References

9 links