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Networks

CVE-2025-40833

8.7
High
EPSS 0.32%May 12, 2026

DoS via null pointer dereference on crafted IPv4 requests.

common questions

Is CVE-2025-40833 being exploited?

Not confirmed. CVE-2025-40833 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.

How severe is CVE-2025-40833?

CVE-2025-40833 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2025-40833?

Not known from our data. No patch reference has been recorded for CVE-2025-40833, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.

What does CVE-2025-40833 affect?

CVE-2025-40833 affects Unspecified devices. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2025-40833?

Monitor traffic; patch when released.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Unspecified devices
impact

Denial of service by crashing device through crafted IPv4 requests; requires manual restart to recover.

action required

Monitor only

affected versions
Siemens IE/PB LINK HA
  • affected< V4.1.2
Siemens IE/PB link PN IO
  • affected< *
Siemens RUGGEDCOM RM1224 LTE(4G) EU
  • affected< V8.3
Siemens RUGGEDCOM RM1224 LTE(4G) NAM
  • affected< V8.3
Siemens SCALANCE M804PB
  • affected< V8.3
Siemens SCALANCE M812-1 ADSL-Router
  • affected< V8.3
Siemens SCALANCE M816-1 ADSL-Router
  • affected< V8.3
Siemens SCALANCE M826-2 SHDSL-Router
  • affected< V8.3
Siemens SCALANCE M874-2
  • affected< V8.3
Siemens SCALANCE M874-3
  • affected< V8.3
Siemens SCALANCE M874-3 3G-Router (CN)
  • affected< V8.3
Siemens SCALANCE M876-3
  • affected< V8.3
Siemens SCALANCE M876-3 (ROK)
  • affected< V8.3
Siemens SCALANCE M876-4
  • affected< V8.3
Siemens SCALANCE M876-4 (EU)
  • affected< V8.3
Siemens SCALANCE M876-4 (NAM)
  • affected< V8.3
Siemens SCALANCE MUB852-1 (A1)
  • affected< V8.3
Siemens SCALANCE MUB852-1 (B1)
  • affected< V8.3
Siemens SCALANCE MUM853-1 (A1)
  • affected< V8.3
Siemens SCALANCE MUM853-1 (B1)
  • affected< V8.3
Siemens SCALANCE MUM853-1 (EU)
  • affected< V8.3
Siemens SCALANCE MUM856-1 (A1)
  • affected< V8.3
Siemens SCALANCE MUM856-1 (B1)
  • affected< V8.3
Siemens SCALANCE MUM856-1 (CN)
  • affected< V8.3
Siemens SCALANCE MUM856-1 (EU)
  • affected< V8.3
Siemens SCALANCE MUM856-1 (RoW)
  • affected< V8.3
Siemens SCALANCE S615 EEC LAN-Router
  • affected< V8.3
Siemens SCALANCE S615 LAN-Router
  • affected< V8.3
Siemens SCALANCE SC622-2C
  • affected< V3.2
Siemens SCALANCE SC626-2C
  • affected< V3.2
Siemens SCALANCE SC632-2C
  • affected< V3.2
Siemens SCALANCE SC636-2C
  • affected< V3.2
Siemens SCALANCE SC642-2C
  • affected< V3.2
Siemens SCALANCE SC646-2C
  • affected< V3.2
Siemens SCALANCE W1748-1 M12
  • affected< *
Siemens SCALANCE W1788-1 M12
  • affected< *
Siemens SCALANCE W1788-2 EEC M12
  • affected< *
Siemens SCALANCE W1788-2IA M12
  • affected< *
Siemens SCALANCE W1788-2 M12
  • affected< *
Siemens SCALANCE W721-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W722-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W734-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W734-1 RJ45 (USA)
  • affected< V6.6.0
Siemens SCALANCE W738-1 M12
  • affected< V6.6.0
Siemens SCALANCE W748-1 M12
  • affected< V6.6.0
Siemens SCALANCE W748-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W761-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W774-1 M12 EEC
  • affected< V6.6.0
Siemens SCALANCE W774-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W774-1 RJ45 (USA)
  • affected< V6.6.0
Siemens SCALANCE W778-1 M12
  • affected< V6.6.0
Siemens SCALANCE W778-1 M12 EEC
  • affected< V6.6.0
Siemens SCALANCE W778-1 M12 EEC (USA)
  • affected< V6.6.0
Siemens SCALANCE W786-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W786-2IA RJ45
  • affected< V6.6.0
Siemens SCALANCE W786-2 RJ45
  • affected< V6.6.0
Siemens SCALANCE W786-2 SFP
  • affected< V6.6.0
Siemens SCALANCE W788-1 M12
  • affected< V6.6.0
Siemens SCALANCE W788-1 RJ45
  • affected< V6.6.0
Siemens SCALANCE W788-2 M12
  • affected< V6.6.0
Siemens SCALANCE W788-2 M12 EEC
  • affected< V6.6.0
Siemens SCALANCE W788-2 RJ45
  • affected< V6.6.0
Siemens SCALANCE WAB762-1
  • affected< V3.2.0
Siemens SCALANCE WAM763-1
  • affected< V3.2.0
Siemens SCALANCE WAM763-1 (ME)
  • affected< V3.2.0
Siemens SCALANCE WAM763-1 (US)
  • affected< V3.2.0
Siemens SCALANCE WAM766-1
  • affected< V3.2.0
Siemens SCALANCE WAM766-1 EEC
  • affected< V3.2.0
Siemens SCALANCE WAM766-1 EEC (ME)
  • affected< V3.2.0
Siemens SCALANCE WAM766-1 EEC (US)
  • affected< V3.2.0
Siemens SCALANCE WAM766-1 (ME)
  • affected< V3.2.0
Siemens SCALANCE WAM766-1 (US)
  • affected< V3.2.0
Siemens SCALANCE WUB762-1
  • affected< V3.2.0
Siemens SCALANCE WUB762-1 iFeatures
  • affected< V3.2.0
Siemens SCALANCE WUM763-1
  • affected< V3.2.0
Siemens SCALANCE WUM763-1 (US)
  • affected< V3.2.0
Siemens SCALANCE WUM766-1
  • affected< V3.2.0
Siemens SCALANCE WUM766-1 (ME)
  • affected< V3.2.0
Siemens SCALANCE WUM766-1 (USA)
  • affected< V3.2.0
Siemens SCALANCE X204-2
  • affected< *
Siemens SCALANCE X204-2FM
  • affected< *
Siemens SCALANCE X204-2LD
  • affected< *
Siemens SCALANCE X204-2LD TS
  • affected< *
Siemens SCALANCE X204-2TS
  • affected< *
Siemens SCALANCE X206-1
  • affected< *
Siemens SCALANCE X206-1LD
  • affected< *
Siemens SCALANCE X208
  • affected< *
Siemens SCALANCE X208PRO
  • affected< *
Siemens SCALANCE X212-2
  • affected< *
Siemens SCALANCE X212-2LD
  • affected< *
Siemens SCALANCE X216
  • affected< *
Siemens SCALANCE X224
  • affected< *
Siemens SCALANCE X302-7 EEC (230V)
  • affected< *
Siemens SCALANCE X302-7 EEC (230V, coated)
  • affected< *
Siemens SCALANCE X302-7 EEC (24V)
  • affected< *
Siemens SCALANCE X302-7 EEC (24V, coated)
  • affected< *
Siemens SCALANCE X302-7 EEC (2x 230V)
  • affected< *
Siemens SCALANCE X302-7 EEC (2x 230V, coated)
  • affected< *
Siemens SCALANCE X302-7 EEC (2x 24V)
  • affected< *
Siemens SCALANCE X302-7 EEC (2x 24V, coated)
  • affected< *
Siemens SCALANCE X304-2FE
  • affected< *
Siemens SCALANCE X306-1LD FE
  • affected< *
Siemens SCALANCE X307-2 EEC (230V)
  • affected< *
Siemens SCALANCE X307-2 EEC (230V, coated)
  • affected< *
Siemens SCALANCE X307-2 EEC (24V)
  • affected< *
Siemens SCALANCE X307-2 EEC (24V, coated)
  • affected< *
Siemens SCALANCE X307-2 EEC (2x 230V)
  • affected< *
Siemens SCALANCE X307-2 EEC (2x 230V, coated)
  • affected< *
Siemens SCALANCE X307-2 EEC (2x 24V)
  • affected< *
Siemens SCALANCE X307-2 EEC (2x 24V, coated)
  • affected< *
Siemens SCALANCE X307-3
  • affected< *
Siemens SCALANCE X307-3LD
  • affected< *
Siemens SCALANCE X308-2
  • affected< *
Siemens SCALANCE X308-2LD
  • affected< *
Siemens SCALANCE X308-2LH
  • affected< *
Siemens SCALANCE X308-2LH+
  • affected< *
Siemens SCALANCE X308-2M
  • affected< *
Siemens SCALANCE X308-2M PoE
  • affected< *
Siemens SCALANCE X308-2M TS
  • affected< *
Siemens SCALANCE X308-2 RD (inkl. SIPLUS variants)
  • affected< *
Siemens SCALANCE X310
  • affected< *
Siemens SCALANCE X310FE
  • affected< *
Siemens SCALANCE X320-1-2LD FE
  • affected< *
Siemens SCALANCE X320-1 FE
  • affected< *
Siemens SCALANCE X408-2
  • affected< *
Siemens SCALANCE XF204
  • affected< *
Siemens SCALANCE XF204-2
  • affected< *
Siemens SCALANCE XF206-1
  • affected< *
Siemens SCALANCE XF208
  • affected< *
Siemens SCALANCE XM408-4C
  • affected< *
Siemens SCALANCE XM408-4C (L3 int.)
  • affected< *
Siemens SCALANCE XM408-8C
  • affected< *
Siemens SCALANCE XM408-8C (L3 int.)
  • affected< *
Siemens SCALANCE XM416-4C
  • affected< *
Siemens SCALANCE XM416-4C (L3 int.)
  • affected< *
Siemens SCALANCE XR324-12M (230V, ports on front)
  • affected< *
Siemens SCALANCE XR324-12M (230V, ports on rear)
  • affected< *
Siemens SCALANCE XR324-12M (24V, ports on front)
  • affected< *
Siemens SCALANCE XR324-12M (24V, ports on rear)
  • affected< *
Siemens SCALANCE XR324-12M TS (24V)
  • affected< *
Siemens SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front)
  • affected< *
Siemens SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear)
  • affected< *
Siemens SCALANCE XR324-4M EEC (24V, ports on front)
  • affected< *
Siemens SCALANCE XR324-4M EEC (24V, ports on rear)
  • affected< *
Siemens SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front)
  • affected< *
Siemens SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear)
  • affected< *
Siemens SCALANCE XR324-4M EEC (2x 24V, ports on front)
  • affected< *
Siemens SCALANCE XR324-4M EEC (2x 24V, ports on rear)
  • affected< *
Siemens SCALANCE XR324-4M PoE (230V, ports on front)
  • affected< *
Siemens SCALANCE XR324-4M PoE (230V, ports on rear)
  • affected< *
Siemens SCALANCE XR324-4M PoE (24V, ports on front)
  • affected< *
Siemens SCALANCE XR324-4M PoE (24V, ports on rear)
  • affected< *
Siemens SCALANCE XR324-4M PoE TS (24V, ports on front)
  • affected< *
Siemens SCALANCE XR524-8C, 1x230V
  • affected< *
Siemens SCALANCE XR524-8C, 1x230V (L3 int.)
  • affected< *
Siemens SCALANCE XR524-8C, 24V
  • affected< *
Siemens SCALANCE XR524-8C, 24V (L3 int.)
  • affected< *
Siemens SCALANCE XR524-8C, 2x230V
  • affected< *
Siemens SCALANCE XR524-8C, 2x230V (L3 int.)
  • affected< *
Siemens SCALANCE XR526-8C, 1x230V
  • affected< *
Siemens SCALANCE XR526-8C, 1x230V (L3 int.)
  • affected< *
Siemens SCALANCE XR526-8C, 24V
  • affected< *
Siemens SCALANCE XR526-8C, 24V (L3 int.)
  • affected< *
Siemens SCALANCE XR526-8C, 2x230V
  • affected< *
Siemens SCALANCE XR526-8C, 2x230V (L3 int.)
  • affected< *
Siemens SCALANCE XR528-6M
  • affected< *
Siemens SCALANCE XR528-6M (2HR2)
  • affected< *
Siemens SCALANCE XR528-6M (2HR2, L3 int.)
  • affected< *
Siemens SCALANCE XR528-6M (L3 int.)
  • affected< *
Siemens SCALANCE XR552-12M
  • affected< *
Siemens SCALANCE XR552-12M (2HR2)
  • affected< *
Siemens SCALANCE XR552-12M (2HR2, L3 int.)
  • affected< *
Siemens SIMATIC CFU DIQ
  • affected< V2.0.0
Siemens SIMATIC CFU PA
  • affected< V2.0.0
Siemens SIMATIC ET 200pro IM 154-8F PN/DP CPU
  • affected< *
Siemens SIMATIC ET 200pro IM 154-8FX PN/DP CPU
  • affected< *
Siemens SIMATIC ET 200pro IM 154-8 PN/DP CPU
  • affected< *
Siemens SIMATIC ET 200S IM 151-8F PN/DP CPU
  • affected< *
Siemens SIMATIC ET 200S IM 151-8 PN/DP CPU
  • affected< *
Siemens SIMATIC ET 200SP CPU 1510SP-1 PN
  • affected< *
Siemens SIMATIC ET 200SP CPU 1510SP F-1 PN
  • affected< *
Siemens SIMATIC ET 200SP CPU 1512SP-1 PN
  • affected< *
Siemens SIMATIC ET 200SP CPU 1512SP F-1 PN
  • affected< *
Siemens SIMATIC ET 200SP HA IM155-6 PN
  • affected< V1.3
Siemens SIMATIC S7-1500 CPU 1511-1 PN
  • affected< *
Siemens SIMATIC S7-1500 CPU 1511F-1 PN
  • affected< *
Siemens SIMATIC S7-1500 CPU 1513-1 PN
  • affected< *
Siemens SIMATIC S7-1500 CPU 1515-2 PN
  • affected< *
Siemens SIMATIC S7-1500 CPU 1515F-2 PN
  • affected< *
Siemens SIMATIC S7-1500 CPU 1516-3 PN/DP
  • affected< *
Siemens SIMATIC S7-1500 CPU 1516F-3 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 314C-2 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 315-2 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 315F-2 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 315T-3 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 317-2 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 317F-2 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 317T-3 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 317TF-3 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 319-3 PN/DP
  • affected< *
Siemens SIMATIC S7-300 CPU 319F-3 PN/DP
  • affected< *
Siemens SIMATIC S7-400 CPU 412-2 PN V7
  • affected< *
Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7
  • affected< *
Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7
  • affected< *
Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7
  • affected< *
Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7
  • affected< *
Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)
  • affected< *
Siemens SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants)
  • affected< V10.2
Siemens SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants)
  • affected< V8.3
Siemens SIMIT UNIT V10
  • affected< *
Siemens SIMIT UNIT V11
  • affected< *
Siemens SINAMICS CBE20
  • affected< *
Siemens SINAMICS G115D
  • affected< *
Siemens SINAMICS G120C
  • affected< *
Siemens SINAMICS G120D
  • affected< *
Siemens SINAMICS G120 (incl. SIPLUS variants)
  • affected< *
Siemens SINAMICS G120X
  • affected< *
Siemens SINAMICS G120XA
  • affected< *
Siemens SINAMICS G130
  • affected< *
Siemens SINAMICS G150
  • affected< *
Siemens SINAMICS S110
  • affected< *
Siemens SINAMICS S120 (incl. SIPLUS variants)
  • affected< *
Siemens SINAMICS S150
  • affected< *
Siemens SINUMERIK 840D sl
  • affected< *
Siemens SIPLUS ET 200S IM 151-8F PN/DP CPU
  • affected< *
Siemens SIPLUS ET 200S IM 151-8 PN/DP CPU
  • affected< *
Siemens SIPLUS NET IE/PB link PN IO
  • affected< *
Siemens SIPLUS S7-300 CPU 314C-2 PN/DP
  • affected< *
Siemens SIPLUS S7-300 CPU 315-2 PN/DP
  • affected< *
Siemens SIPLUS S7-300 CPU 315F-2 PN/DP
  • affected< *
Siemens SIPLUS S7-300 CPU 317-2 PN/DP
  • affected< *
Siemens SIPLUS S7-300 CPU 317F-2 PN/DP
  • affected< *
Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7
  • affected< *
Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7
  • affected< *
Siemens SITOP PSU8600 1AC 20 A/4x5 A PN
  • affected< *
Siemens SITOP PSU8600 3AC 20 A/4x5 A PN
  • affected< *
Siemens SITOP PSU8600 3AC 20 A PN
  • affected< *
Siemens SITOP PSU8600 3AC 40 A/4x10A EIP
  • affected< *
Siemens SITOP PSU8600 3AC 40 A/4x10 A PN
  • affected< *
Siemens SITOP PSU8600 3AC 40 A PN
  • affected< *
Siemens SITOP UPS1600 10 A Ethernet/ PROFINET
  • affected< *
Siemens SITOP UPS1600 20 A Ethernet/ PROFINET
  • affected< *
Siemens SITOP UPS1600 40 A Ethernet/ PROFINET
  • affected< *
Siemens SITOP UPS1600 EX 20 A Ethernet PROFINET
  • affected< *

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
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