🛡️ CVE-2022-35409 — debian-linux

🔴 CVSS 9.1 — Critical ⚠️ Exploit Public CWE-125 NVD

9.1

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

An issue was discovered in Mbed TLS before 2.28.1 and 3.x before 3.2.0. In some configurations, an unauthenticated attacker can send an invalid ClientHello message to a DTLS server that causes a heap-based buffer over-read of up to 255 bytes. This can cause a server crash or possibly information disclosure based on error responses. Affected configurations have MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE enabled and MBEDTLS_SSL_IN_CONTENT_LEN less than a threshold that depends on the configuration: 258 bytes if using mbedtls_ssl_cookie_check, and possibly up to 571 bytes with a custom cookie check function.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability high.

Weakness class

CVE-2022-35409 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.

Affected software

CVE-2022-35409 is recorded against 2 packages.

debian-linux
mbed-tls (from 3.0.0 up to 3.2.0)

Timeline and source

Published on 15 July 2022 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
lists.debian.org
mbed-tls.readthedocs.io
github.com
lists.debian.org
mbed-tls.readthedocs.io

CVE-2022-35409 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Alpine Debian Ubuntu

Details

Severity CRITICAL

CVSS Score 9.1

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE CWE-125

Public Exploit ⚠️ Yes

Source NVD

Published 2022-07-15

Updated 2026-08-20

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
debian-linux	—	—
mbed-tls	3.0.0	3.2.0

References

Release Notes https://github.com/Mbed-TLS/mbedtls/releases

Mailing List, Third Party Advisory https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html

Exploit, Mitigation, Vendor Advisory https://mbed-tls.readthedocs.io/en/latest/security-advisories/advisories/mbedtls-security-advisory-2022-07.html

Release Notes https://github.com/Mbed-TLS/mbedtls/releases

Mailing List, Third Party Advisory https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html

Exploit, Mitigation, Vendor Advisory https://mbed-tls.readthedocs.io/en/latest/security-advisories/advisories/mbedtls-security-advisory-2022-07.html

🔗 NVD 🔗 Mitre

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