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Full vulnerability report · 2026
CVE-2025-40833High confidence

The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests

Siemens · IE/PB LINK HA

Official source article: Siemens SSA-392349 ↗. Check the applicable product and release in the original source.

8.7HighCVSS 4.0
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 305 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.32% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Siemens IE/PB LINK HA and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 305 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
SSA-392349 · CSAF 2.0 · revision 3 · interimSiemens ProductCERTSSA-392349: Denial of Service Vulnerability in Industrial Devices
305 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • IE/PB LINK HA (6GK1411-5BB00) < V4.1.2
  • IE/PB link PN IO (6GK1411-5AB10)
  • RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) < V8.3
  • RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2) < V8.3
  • SCALANCE M804PB (6GK5804-0AP00-2AA2) < V8.3
  • SCALANCE M812-1 ADSL-Router (6GK5812-1AA00-2AA2) < V8.3
  • SCALANCE M812-1 ADSL-Router (6GK5812-1BA00-2AA2) < V8.3
  • SCALANCE M816-1 ADSL-Router (6GK5816-1AA00-2AA2) < V8.3
  • SCALANCE M816-1 ADSL-Router (6GK5816-1BA00-2AA2) < V8.3
  • SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2) < V8.3
  • SCALANCE M874-2 (6GK5874-2AA00-2AA2) < V8.3
  • SCALANCE M874-3 (6GK5874-3AA00-2AA2) < V8.3
Summary
The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system.
Remediation
Update to V10.2 or later version
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2025-209778

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 305 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system.

What

The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → NULL Pointer Dereference → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-476 ↗

CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-476
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-1467Siemens SIMATIC S7: Schwachstelle ermöglicht Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Siemens SIMATIC S7 ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0565Multiples vulnérabilités dans les produits Siemens

ANCE MUM853-1 (EU) (6GK5853-2EA00-2DA1) versions antérieures à 8.3 SCALANCE MUM856-1 (A1) (6GK5856-2EA10-3AA1) versions antérieures à 8.3 SCALANCE MUM856-1 (B1) (6GK5856-2EA10-3BA1) versions antérieures à 8.3 SCALANCE MUM856-1 (CN) (6GK5856-2EA00-3FA1) versions antérieures à 8.3 SCALANCE MUM856-1 (EU) (6GK5856-2EA00-3DA1) versions antérieures à 8.3 SCALANCE MUM856-1 (RoW) (6GK5856-2EA00-3AA1) versions antérieures à 8.3 SCALANCE S615 EEC LAN-Router (6GK5615-0AA01-2AA2) versions antérieures à 8.3 SCALANCE S615 LAN-Router (6GK5615-0AA00-2AA2) versions antérieures à 8.3 SCALANCE SC622-2C (6GK5622-2GS00-2AC2) toutes versions pour la vulnérabilité CVE-2025-40833 SCALANCE SC626-2C (6GK5626-2GS00-2AC2) toutes versions pour la vulnérabilité CVE-2025-40833 SCALANCE SC632-2C (6GK5632-2GS00-2AC2) toutes versions pour la vulnérabilité CVE-2025-40833 SCALANCE SC636-2C (6GK5636-2GS00-2AC2) toutes versions pour la vulnérabilité CVE-2025-40833 SCALANCE SC642-2C (6GK5642-2GS00-2AC2) toutes versions pour la vulnérabilité CVE-2025-40833 SCALANCE SC646-2C (6GK5646-2GS00-2AC2) toutes versions pour la vulnérabilité CVE-2025-40833 SCALANCE W1748-1 M12 (6GK5748-1GY01-0AA0) toutes versions. L'éditeur indique que le produit ne bénéficiera pas de correctif de sécurité pour la vulnérabilité CVE-2025-40833. SCALANCE W1748-

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0147Kwetsbaarheden verholpen in Siemens-producten

Certain devices exhibit a null pointer dereference vulnerability in processing specific IPv4 requests, which can lead to a denial of service condition requiring manual system restart.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 12 May 2026 · Last source change 11 Aug 2026, 12:20 UTC · CWE-476 · NULL Pointer Dereference

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-209778
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    Siemens ProductCERT ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Remediation guidance recorded
ENISA EUVD · EUVD-2025-209778↗CVE authority or vendor reference · Siemens SSA-392349↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2025-40833 · cve.blacktree.nl