Vulnerability · Published Jul 14, 2021 · Assigned by mitre
CVE-2021-24119
Medium 4.9
In plain English
A medium-severity security flaw in the mbedtls package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)4.9Medium
Exploit odds (30 days)1.5%top 25.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mbedtls | 2.16.11-0.1 | DEBIAN-CVE-2021-24119 |
| Debian:13 | mbedtls | 2.16.11-0.1 | DEBIAN-CVE-2021-24119 |
| Debian:14 | mbedtls | 2.16.11-0.1 | DEBIAN-CVE-2021-24119 |
| Ubuntu:25.10 | mbedtls | no fix listed | UBUNTU-CVE-2021-24119 |
| Ubuntu:26.04:LTS | mbedtls | no fix listed | UBUNTU-CVE-2021-24119 |
| Ubuntu:26.10 | mbedtls | no fix listed | UBUNTU-CVE-2021-24119 |
Affected products (as reported)
References
- https://github.com/ARMmbed/mbedtls/releases
- https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.md
- FEDORA-2021-10bfc067d1 vendor-advisory
- FEDORA-2021-165969af24 vendor-advisory
- [debian-lts-announce] 20211123 [SECURITY] [DLA 2826-1] mbedtls security update mailing-list
- [debian-lts-announce] 20221225 [SECURITY] [DLA 3249-1] mbedtls security update mailing-list
- https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html