> CVE-2026-1677 [MEDIUM]

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PUBLISHED
2026-05-11 06:16
MODIFIED
2026-05-11 06:16
CVSS_SCORE V3
5.3
EPSS (Prob. Exploit)
0.24%
Top 84.4%
DATA SOURCES:
NVD 🔗 2026-05-11 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-08 OSV 🔗 2026-10-26

> 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_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EXPLOITABILITY
3.9
IMPACT
1.4

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-757

> CWE DETAILED DESCRIPTIONS

CWE-757: Selection of Less-Secure Algorithm During Negotiation - A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used in a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

net: TLS 1.2 connections allowed on TLS 1.3 sockets

AFFECTED PACKAGES:
Unknown / Unknown
155 versions affected
ALIASES:
GHSA-23r2-m5wx-4rvq

> HISTORIQUE DES MODIFICATIONS

Première apparition
11/05/2026 06:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') - A protocol or its implementation supports interaction between multiple actors and allows those actors to negoti...
Nouvelle valeur:
CWE-757: Selection of Less-Secure Algorithm During Negotiation - A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm shou...
📊 ENRICHISSEMENT 01/06/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') - A protocol or its implementation supports interaction between multiple actors and allows those actors to negoti...
Total des modifications: 2 Dernière mise à jour: 1 week ago

> REFERENCES

https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-23r2-m5wx-...
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