Multiple vulnerabilities in StrongSwan

Advisory ID CVE Number Date discovered Severity Advisory revision
STORM-2026-013 CVE-2026-47895 , CVE-2026-35332 , CVE-2026-35330 , CVE-2026-35328 , CVE-2026-25075 06/09/2026 medium v2

Vulnerability details

Some security flaws have been identified in StrongSwan, a component used in SNS appliances to create IPsec tunnels.

Impacted products

ProductsSeverityDetail
Stormshield Network Security medium SNS is impacted

Revisions

Version Date Description
v1 07/30/2026 Initial release (reserved)
v2  08/03/2026 Public release


Stormshield Network Security

CVSS v3.1 Overall Score: 6.5      

Analysis

Impacted version

An attacker could exploit these vulnerabilities to remotely cause a crash of the VPN service, and potentially execute code remotely.

The “Restricted Broadcast” mode (Diffusion Restreinte) is not affected by these vulnerabilities.
  • SNS 5.1.0
  • SNS 5.0.0 to 5.0.6
  • SNS 4.8.0 to 4.8.16
  • SNS 4.3.0 to 4.3.43
  • SNS 3.11.0 to 3.11.31
  • SNS 3.7.0 to 3.7.44

Workaround solution

Solution

CVE-2026-47895 :

  • Disable the IKEv1 key exchange protocol for creating VPN tunnels (deprecated).
  • For IKEv2 use cases, disable authentication via EAP‑GTC.

CVE-2026-35332 :

  • Disable TLS-based EAP methods, or allow TLS 1.3 only

CVE-2026-35330 :

  • Disable EAP-SIM/AKA authentication method

CVE-2026-35328 :

  • Disable TLS-based EAP methods

CVE-2026-25075 :

  • Disable EAP-TTLS authentication method

 

The following updates will fix these vulnerabilities:

  • SNS 5.1.1
  • SNS 5.0.7
  • SNS 4.8.17
  • SNS 4.3.44
  • SNS 3.7.45


Attack Vector Attack Complexity Privileges Required User Interaction Scope Confidentiality Impact Integrity Impact Availability impact
Network Low None None Unchanged None None High
CVSS Base score: 7.5 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Exploit Code Maturity Remediation Level Report Confidence
Unproven that exploit exists Official fix Confirmed
CVSS Temporal score: 6.5 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Confidentiality Requirement (CR) Integrity Requirement (IR) Availability Requirement (AR)
Low Low Medium
CVSS Environmental score: 6.5 CVSS Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C/CR:L/IR:L/AR:M/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X)