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Fencer Vulns
medium 4.9

CVE-2021-24119 json

In Trusted Firmware Mbed TLS 2.24.0, a side-channel vulnerability in base64 PEM file decoding allows...

published 2021-07-14 5 y ago modified 2026-07-18 3 mo ago also EUVD-2021-11034 , JLSEC-2025-203

cvss
4.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia MbedTLS_jll 2.26.0+0
  • arm mbed_tls 2.26.0
  • mbedtls Debian 14, Debian 13, Debian 12 2.16.11-0.1

debian advisories DEBIAN-CVE-2021-24119

  • mbedtls-3 openSUSE Tumbleweed 3.6.6-1.1
  • mbedtls-2 openSUSE Tumbleweed 2.27.0-2.1
  • mbedtls Package Hub 15 SP3, openSUSE Leap 15.3 2.16.9-bp153.2.5.1
  • mbedtls Package Hub 15 SP2 2.16.9-bp152.2.6.1
  • mbedtls openSUSE Leap 15.2 2.16.9-lp152.2.6.1

opensuse advisories openSUSE-SU-2026:11119-1openSUSE-SU-2024:11552-1openSUSE-SU-2021:1389-1openSUSE-SU-2021:1355-1openSUSE-SU-2021:1344-1

  • mbedtls Arch Linux 2.26.0-1

arch linux advisories AVG-2153

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-24119 updated cvss 4.9

mbedtls: side-channel vulnerability allows system-level-attacker information disclosure

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.48% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:P/I:N/A:N
OSV 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia MbedTLS_jll
<2.26.0+0
2.26.0+0

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.