A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityUnreported
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | nvd | AV: P→N, AC: H→L, PR: H→N, UI: A→N, VA: N→H | 0.0 → 4.6 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 0.0 |
Affected Software
| Vendor | Product | Version |
|---|
| Siemens | SIMATIC MV400 family | < 7.0.6 |
| siemens | simatic_mv420_sr-b_body_firmware | < 7.0.6 |
| siemens | simatic_mv420_sr-b_firmware | < 7.0.6 |
| siemens | simatic_mv420_sr-p_body_firmware | < 7.0.6 |
| siemens | simatic_mv420_sr-p_firmware | < 7.0.6 |
| siemens | simatic_mv440_hr_firmware | < 7.0.6 |
| siemens | simatic_mv440_sr_firmware | < 7.0.6 |
| siemens | simatic_mv440_ur_firmware | < 7.0.6 |
Published: 2021-03-15
