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CVE-2020-28397

A vulnerability has been identified in SIMATIC Drive Controller family (All versions < V2.9.2), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions < V21.9), SIMATIC S7 PLCSIM Advanced (All versions > V2 < V4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (Version V4.4), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions > V2.5 < V2.9.2), SIMATIC S7-1500 Software Controller (All versions > V2.5 < V21.9), TIM 1531 IRC (incl. SIPLUS NET variants) (Version V2.1). Due to an incorrect authorization check in the affected component, an attacker could extract information about access protected PLC program variables over port 102/tcp from an affected device when reading multiple attributes at once.
An official patch is available. Apply the patch as soon as possible.
5.3
CVSS
1.7
ShadowTrackr
NO
CISA KEV
-
NCSC.nl
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityUnreported
Vulnerable System
ConfidentialityLow
IntegrityNone
AvailabilityNone
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusOfficial Patch

Change Log
DateSourceChangesScore
2026-07-21nvdAV: P→N, AC: H→L, PR: H→N, UI: A→N, VC: N→L0.0 → 1.7
2026-07-21nvdpatch: Unavailable→Official Patch0.0 → 0.0
2026-07-21cve.orginitial, patch: Unavailable0.0
References: CVE.org · NVD

Affected Software
VendorProductVersion
siemenscpu_1211c_firmware4.4
siemenscpu_1212c_firmware4.4
siemenscpu_1212fc_firmware4.4
siemenscpu_1214c_firmware4.4
siemenscpu_1214fc_firmware4.4
siemenscpu_1215c_firmware4.4
siemenscpu_1215fc_firmware4.4
siemenscpu_1217c_firmware4.4
siemenscpu_1504d_tf_firmware< 2.9.2
siemenscpu_1507d_tf_firmware< 2.9.2
siemenscpu_1510sp-1pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1511-1pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1511c-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1511f-1pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1511t-1pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1511tf-1pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1512c-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1512sp_f-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1512sp-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1513-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1513f-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1513pro_f-2_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1513r-1_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1515-2_firmware≥ 2.5, < 2.9.2
siemenscpu_1515f-2_firmware≥ 2.5, < 2.9.2
siemenscpu_1515r-2_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1515sp_pc2_tf_firmware< 21.9
siemenscpu_1515t-2_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1515tf-2_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1516-3_firmware≥ 2.5, < 2.9.2
siemenscpu_1516f-3_firmware≥ 2.5, < 2.9.2.
siemenscpu_1516pro_f-2_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1516pro-2_pn_firmware≥ 2.5, < 2.9.2
siemenscpu_1516t-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1516tf-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1517-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1517f-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1517t-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1517tf-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1518-4_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu_1518f-4_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenscpu1510sp_f-1_firmware≥ 2.5, < 2.9.2
SiemensSIMATIC Drive Controller family< 2.9.2
SiemensSIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)< 21.9
SiemensSIMATIC S7 PLCSIM Advanced> 2, < 4
SiemensSIMATIC S7-1200 CPU family (incl. SIPLUS variants)Version V4.4
SiemensSIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)> 2.5, < 2.9.2
SiemensSIMATIC S7-1500 Software Controller> 2.5, < 21.9
siemenssimatic_s7_plcsim_advanced_firmware≥ 2.0, < 4.0
siemenssimatic_s7-1500_software_controller≥ 2.5, < 21.9
siemenssiplus_cpu_1510sp_f-1pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1511-1_pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1511f-1_pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1512sp_f-1pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1512sp-1_pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1513-1_pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1513f-1_pn_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1516-3_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1518-4_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu_1518f-4_pn\/dp_firmware≥ 2.5, < 2.9.2
siemenssiplus_cpu-1516f-3_pn\/dp_firmware≥ 2.5, < 2.9.2
SiemensTIM 1531 IRC (incl. SIPLUS NET variants)Version V2.1
siemenstim_1531_irc_firmware2.1
Published: 2021-08-10