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.

Published: 2021-08-10 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-28397 is rated Low Risk (39.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.75%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-28397

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.18% 0.75% +0.57%
2 2025-03-30 0.29% 0.18% -0.10%
3 2025-03-29 — 0.29% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-28397

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-28397

Affected software / configurations for CVE-2020-28397

Vendor Product Version Raw CPE
siemens cpu_1504d_tf_firmware < 2.9.2 cpe:2.3:o:siemens:cpu_1504d_tf_firmware:*:*:*:*:*:*:*:*
siemens cpu_1507d_tf_firmware < 2.9.2 cpe:2.3:o:siemens:cpu_1507d_tf_firmware:*:*:*:*:*:*:*:*
siemens cpu_1515sp_pc2_tf_firmware < 21.9 cpe:2.3:o:siemens:cpu_1515sp_pc2_tf_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7_plcsim_advanced_firmware >= 2.0, < 4.0 cpe:2.3:o:siemens:simatic_s7_plcsim_advanced_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-1500_software_controller >= 2.5, < 21.9 cpe:2.3:a:siemens:simatic_s7-1500_software_controller:*:*:*:*:*:*:*:*
siemens tim_1531_irc_firmware 2.1 cpe:2.3:o:siemens:tim_1531_irc_firmware:2.1:*:*:*:*:*:*:*
siemens cpu_1211c_firmware 4.4 cpe:2.3:o:siemens:cpu_1211c_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1212c_firmware 4.4 cpe:2.3:o:siemens:cpu_1212c_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1212fc_firmware 4.4 cpe:2.3:o:siemens:cpu_1212fc_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1214fc_firmware 4.4 cpe:2.3:o:siemens:cpu_1214fc_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1214c_firmware 4.4 cpe:2.3:o:siemens:cpu_1214c_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1215fc_firmware 4.4 cpe:2.3:o:siemens:cpu_1215fc_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1215c_firmware 4.4 cpe:2.3:o:siemens:cpu_1215c_firmware:4.4:*:*:*:*:*:*:*
siemens cpu_1217c_firmware 4.4 cpe:2.3:o:siemens:cpu_1217c_firmware:4.4:*:*:*:*:*:*:*
siemens siplus_cpu_1510sp_f-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1510sp_f-1pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1511-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1511-1_pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1511f-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1511f-1_pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1512sp-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1512sp-1_pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1512sp_f-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1512sp_f-1pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1513-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1513-1_pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1513f-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1513f-1_pn_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1516-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1516-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu-1516f-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu-1516f-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1518-4_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1518-4_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens siplus_cpu_1518f-4_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:siplus_cpu_1518f-4_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1510sp-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1510sp-1pn_firmware:*:*:*:*:*:*:*:*
siemens cpu1510sp_f-1_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu1510sp_f-1_firmware:*:*:*:*:*:*:*:*
siemens cpu_1511-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1511-1pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1511c-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1511c-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1511f-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1511f-1pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1511t-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1511t-1pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1511tf-1pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1511tf-1pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1512c-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1512c-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1512sp-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1512sp-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1512sp_f-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1512sp_f-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1513-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1513-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1513f-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1513f-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1513r-1_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1513r-1_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1513pro_f-2_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1513pro_f-2_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1515-2_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1515-2_firmware:*:*:*:*:*:*:*:*
siemens cpu_1515f-2_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1515f-2_firmware:*:*:*:*:*:*:*:*
siemens cpu_1515r-2_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1515r-2_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1515t-2_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1515t-2_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1515tf-2_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1515tf-2_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1516pro_f-2_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1516pro_f-2_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1516pro-2_pn_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1516pro-2_pn_firmware:*:*:*:*:*:*:*:*
siemens cpu_1516-3_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1516-3_firmware:*:*:*:*:*:*:*:*
siemens cpu_1516f-3_firmware >= 2.5, < 2.9.2. cpe:2.3:o:siemens:cpu_1516f-3_firmware:*:*:*:*:*:*:*:*
siemens cpu_1516t-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1516t-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1516tf-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1516tf-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1517-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1517-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1517f-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1517f-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1517t-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1517t-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1517tf-3_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1517tf-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1518-4_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1518-4_pn\/dp_firmware:*:*:*:*:*:*:*:*
siemens cpu_1518f-4_pn\/dp_firmware >= 2.5, < 2.9.2 cpe:2.3:o:siemens:cpu_1518f-4_pn\/dp_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-28397

cvelogic Threat Intelligence