How severe is CVE-2020-28397?

CVE-2020-28397 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-28397 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28397?

CVE-2020-28397 primarily affects Siemens Cpu 1504d Tf Firmware. In total, 56 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-28397?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-28397 published?

CVE-2020-28397 was published on 2021-08-10 and last updated on 2026-06-17.

CVE-2020-28397

CVE-2020-28397 is a medium-severity vulnerability in Siemens Cpu 1504d Tf Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Siemens Cpu 1504d Tf Firmware
Published: 2021-08-10
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-28397?: CVE-2020-28397 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2020-28397 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28397?: CVE-2020-28397 primarily affects Siemens Cpu 1504d Tf Firmware. In total, 56 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-28397?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-28397 published?: CVE-2020-28397 was published on 2021-08-10 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-865327.pdf

Affected products (56)

cpe:2.3:o:siemens:cpu_1504d_tf_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1507d_tf_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1515sp_pc2_tf_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7_plcsim_advanced_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_s7-1500_software_controller:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:tim_1531_irc_firmware:2.1:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1211c_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1212c_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1212fc_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1214fc_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1214c_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1215fc_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1215c_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1217c_firmware:4.4:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1510sp_f-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1511-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1511f-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1512sp-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1512sp_f-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1513-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1513f-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1516-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu-1516f-3_pn\/dp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1518-4_pn\/dp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siplus_cpu_1518f-4_pn\/dp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1510sp-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu1510sp_f-1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1511-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1511c-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1511f-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1511t-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1511tf-1pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1512c-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1512sp-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1512sp_f-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1513-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1513f-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1513r-1_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1513pro_f-2_pn_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:cpu_1515-2_firmware:*:*:*:*:*:*:*:*

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