4.9

CVE-2021-24119: arm mbed_tls Observable Discrepancy

CVSS: 4.9v3.1MediumModified
AliasesopenSUSE-SU-2021:1355-1openSUSE-SU-2021:1389-1UBUNTU-CVE-2021-24119
Published 14-07-2021Last modified 03-11-2025
Open JSON

Vulnerability summary

CVE-2021-24119 is a medium (CVSS 4.9) Observable Discrepancy vulnerability in arm mbed_tls. EPSS estimates a 1.48% chance of exploitation in the next 30 days, higher than 73.5% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
4.9/10
010
Medium · v3.1 (NVD)
EPSS score
1.48%
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 4 · Related 1
DLA-2826-1DLA-3249-1DLA-4236-1OPENSUSE-SU-2026:11119-1

Timeline

  1. 14-07-2021
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

Description

In Trusted Firmware Mbed TLS 2.24.0, a side-channel vulnerability in base64 PEM file decoding allows system-level (administrator) attackers to obtain information about secret RSA keys via a controlled-channel and side-channel attack on software running in isolated environments that can be single stepped, especially Intel SGX.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.48%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.48% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.48%

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

Opensuse3 products
  • mbedtls-2&distro=openSUSE Tumbleweed< 2.27.0-2.1
  • mbedtls&distro=openSUSE Leap 15.2< 2.16.9-lp152.2.6.1
  • mbedtls&distro=openSUSE Leap 15.3< 2.16.9-bp153.2.5.1
Debian2 products
Suse2 products
  • mbedtls&distro=SUSE Package Hub 15 SP2< 2.16.9-bp152.2.6.1
  • mbedtls&distro=SUSE Package Hub 15 SP3< 2.16.9-bp153.2.5.1
Arm1 product
Fedoraproject1 product
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

6 vendors · 10 products

References

15 links
Show all 15 references