Stormshield SNS patches multiple RCE flaws
Multiple vulnerabilities in Stormshield Network Security allow remote code execution, denial of service, and data disclosure; patches are available.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 9 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- A public exploit is recorded for CVE-2026-35330 (poc); no exploitation in the wild is recorded.
ANSSI (CERT-FR) published an advisory detailing multiple vulnerabilities affecting Stormshield Network Security (SNS), a widely deployed firewall/UTM product used by government and enterprise networks primarily in France and Europe. Affected versions span a broad range, including SNS 3.11.x through 4.3.x prior to 4.3.44, 4.8.x prior to 4.8.18, 5.0.x prior to 5.0.8, 5.1.x prior to 5.1.2, and versions prior to 3.7.45, indicating the flaws have persisted across several major release branches.
The vulnerabilities, tracked under nine separate CVE identifiers, collectively enable an attacker to achieve remote code execution, cause remote denial of service, or compromise data confidentiality. No public exploitation has been reported at this time; the advisory is a vendor-coordinated disclosure with corresponding Stormshield security bulletins (2026-013, 2026-014, 2026-015) providing patch guidance. Organizations running affected SNS versions should prioritize upgrading to the fixed releases referenced in the vendor bulletins.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1021
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