Multiple Vulnerabilities in Synology SSL VPN Client Prior to 1.4.5-0684
Summary
CERT-FR published advisory CERTFR-2026-AVI-0431 alerting to multiple vulnerabilities in Synology SSL VPN Client affecting versions prior to 1.4.5-0684. The vulnerabilities could allow attackers to compromise data confidentiality and integrity. The advisory references Synology security bulletin Synology_SA_26_05 and two CVEs (CVE-2021-47960 and CVE-2021-47961). Organizations using the affected product should consult the vendor's security bulletin for patch information.
What changed
CERT-FR issued security advisory CERTFR-2026-AVI-0431 disclosing multiple vulnerabilities in Synology SSL VPN Client (versions prior to 1.4.5-0684). The vulnerabilities pose risks to data confidentiality and integrity. The advisory cites two CVEs: CVE-2021-47960 and CVE-2021-47961.
Organizations using Synology SSL VPN Client should review their deployments against the affected version range, monitor for vendor patch releases, and apply updates as they become available through Synology's official security advisory.
What to do next
- Consult Synology security bulletin Synology_SA_26_05 for patch information
- Review affected versions against deployed systems
- Apply vendor-provided updates when available
Archived snapshot
Apr 14, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Premier Ministre S.G.D.S.N
Agence nationale
de la sécurité des
systèmes d'information
Paris, le 14 avril 2026 N° CERTFR-2026-AVI-0431 Affaire suivie par: CERT-FR
Avis du CERT-FR
Objet: Multiples vulnérabilités dans Synology SSL VPN Client
Gestion du document
| Référence | CERTFR-2026-AVI-0431 |
| Titre | Multiples vulnérabilités dans Synology SSL VPN Client |
| Date de la première version | 14 avril 2026 |
| Date de la dernière version | 14 avril 2026 |
| Source(s) | Bulletin de sécurité Synology SynologySA26_05 du 10 avril 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.
Risques
- Atteinte à l'intégrité des données
- Atteinte à la confidentialité des données
Systèmes affectés
- Synology SSL VPN Client versions antérieures à 1.4.5-0684
Résumé
De multiples vulnérabilités ont été découvertes dans Synology SSL VPN Client. Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Documentation
- Bulletin de sécurité Synology SynologySA26_05 du 10 avril 2026
- https://www.synology.com/en-global/security/advisory/Synology_SA_26_05
- Référence CVE CVE-2021-47960
- https://www.cve.org/CVERecord?id=CVE-2021-47960
- Référence CVE CVE-2021-47961
- https://www.cve.org/CVERecord?id=CVE-2021-47961
Gestion détaillée du document
- le 14 avril 2026 Version initiale
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