7.5

CVE-2020-36426: arm mbed_tls Out-of-bounds Read

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-36426DEBIAN-CVE-2020-36426
Published 19-07-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-36426 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in arm mbed_tls. EPSS estimates a 1.69% chance of exploitation in the next 30 days, higher than 76.6% 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
1.69%
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. mbedtls_x509_crl_parse_der has a buffer over-read (of one byte).

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.69%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

0.00 pp

From 1.69% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.69%

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

8 links