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Uncontrolled Resource ConsumptionWeakness · CWE-400

CVE-2025-27829

HIGH · 7.3 CVSS v3.1 Published 2025-04-01
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
82/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An issue was discovered in Stormshield Network Security (SNS) 4.3.x before 4.3.35. If multicast streams are enabled on different interfaces, it may be possible to interrupt multicast traffic on some of these interfaces. That could result in a denial of the multicast routing service on the firewall.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A denial of service vulnerability in Stormshield SNS 4.3.x allows interruption of multicast traffic on certain interfaces when multicast streams are enabled across multiple interfaces, causing failure of the multicast routing service.

MitigationUpgrade to Stormshield SNS version 4.3.35 or later to patch this vulnerability, and review multicast routing configurations on production firewalls.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Stormshield SNS version
    Run 'clish -c "show version"' or check the product information in the Stormshield admin interface to confirm the installed SNS version
    Affected if The installed version is 4.3.x and is lower than 4.3.35 (the patch was released in version 4.3.35)
  2. Verify multicast routing is enabled
    Check the firewall configuration for multicast routing settings, typically found in the network or routing sections of the SNS admin interface, or run 'multicast status' if available via CLI
    Affected if Multicast routing is enabled and operational on the firewall
  3. Confirm multicast streams across multiple interfaces
    Review the multicast stream configuration to determine if multicast traffic is being routed between two or more distinct interfaces (not just on a single interface)
    Affected if Multicast streams are configured to flow across multiple interfaces simultaneously, enabling the condition that triggers the service failure
  4. Cross-reference version with vulnerability scope
    Compare your confirmed version (from step 1) against the affected range: 4.3.0 through 4.3.34 are vulnerable; versions 4.3.35 and later are patched
    Affected if The firewall runs any version from 4.3.0 to 4.3.34 with multicast routing active across multiple interfaces

You are affected if your Stormshield SNS runs version 4.3.0 through 4.3.34 AND you have multicast routing enabled across multiple interfaces simultaneously.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to Stormshield SNS version 4.3.35 or later to patch this vulnerability, and review multicast routing configurations on production firewalls.

Recommended fix High confidence

Stormshield Network Security (SNS) 4.3.35 or later

  1. 1. Back up the current Stormshield Network Security configuration before initiating any upgrade
  2. 2. Verify the current SNS version is 4.3.x by checking the system information in the administration interface
  3. 3. Download SNS version 4.3.35 or later from the official Stormshield support portal (requires valid support contract)
  4. 4. Review Stormshield release notes for version 4.3.35 to confirm multicast routing improvements are included
  5. 5. Apply the firmware upgrade following Stormshield's standard upgrade procedure (typically via the administration web interface or CLI)
  6. 6. After upgrade completion, verify multicast routing functionality is restored and the vulnerability is resolved
  7. 7. Confirm the running version is 4.3.35 or later in the system information

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA3.0 h
15.0 hours of engineering $2,560
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-27829 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data