CVEvulnerability

CVE-2026-1677

5.3 MEDIUM Published 2026-05-11 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-05-11
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-757

Description

Zephyr sockets created with `IPPROTO_TLS_1_3` can still negotiate a TLS 1.2 connection when both TLS versions are enabled in Kconfig, because the socket-level protocol selection is not propagated to mbedTLS (e.g. via `mbedtls_ssl_conf_min_tls_version`). The ClientHello advertises both versions and the peer can establish TLS 1.2, so applications that assumed `IPPROTO_TLS_1_3` enforces TLS 1.3 may silently use TLS 1.2 and remain exposed to TLS 1.2-specific weaknesses. As a workaround, the `TLS_CIPHERSUITE_LIST` socket option can be restricted to TLS 1.3-only cipher suites.

Affected configurations

• zephyrproject zephyr (<= 4.3.0)

Related

Weakness · CWE (1)

  • CWE-757 Selection of Less-Secure Algorithm During Negotiation weakness

References