CVE-2026-1677— net: TLS 1.2 connections allowed on TLS 1.3 sockets
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I. Basic Information for CVE-2026-1677
Vulnerability Information
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Vulnerability Title
net: TLS 1.2 connections allowed on TLS 1.3 sockets
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在会话协商时选择低安全性的算法(算法降级)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| zephyrproject-rtos | Zephyr | * ~ 4.3 | - |
II. Public POCs for CVE-2026-1677
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: Zephyr
- CVE-2026-5590
net: ip/tcp: Null pointer dereference can be triggered by a - CVE-2026-1679
net: eswifi socket send payload length not bounded - CVE-2026-4179
stm32: usb: Infinite while loop in Interrupt Handler - CVE-2026-0849
crypto: ATAES132A response length allows stack buffer overfl - CVE-2026-1678
dns: memory‑safety issue in the DNS name parser
Same vendor: zephyrproject-rtos
- CVE-2026-5590
net: ip/tcp: Null pointer dereference can be triggered by a - CVE-2026-1679
net: eswifi socket send payload length not bounded - CVE-2026-4179
stm32: usb: Infinite while loop in Interrupt Handler - CVE-2026-0849
crypto: ATAES132A response length allows stack buffer overfl - CVE-2026-1678
dns: memory‑safety issue in the DNS name parser
Same weakness: CWE-757
- CVE-2026-6550
Key commitment policy bypass via shared key cache in AWS Enc - CVE-2026-32650
Anviz CrossChex Standard Algorithm Downgrade - CVE-2026-2673
OpenSSL TLS 1.3 server may choose unexpected key agreement g - CVE-2025-10693
Silicon Labs Z-Wave PIR Sensor Joins Network as Non-Secure - CVE-2025-59270
psPAS does not enforce TLS 1.2 within Get-PASSAMLResponse
V. Comments for CVE-2026-1677
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