How severe is CVE-2021-40359?

CVE-2021-40359 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-40359 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40359?

CVE-2021-40359 primarily affects Siemens Simatic Batch. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-40359?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-40359 published?

CVE-2021-40359 was published on 2021-11-09 and last updated on 2026-06-17.

CVE-2021-40359

CVE-2021-40359 is a high-severity vulnerability in Siemens Simatic Batch with a CVSS 3.x base score of 7.7. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v2: 5.0
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Siemens Simatic Batch
Published: 2021-11-09
Last modified: 2026-06-17

Description

A vulnerability has been identified in OpenPCS 7 V8.2 (All versions), OpenPCS 7 V9.0 (All versions < V9.0 Upd4), OpenPCS 7 V9.1 (All versions), SIMATIC BATCH V8.2 (All versions), SIMATIC BATCH V9.0 (All versions), SIMATIC BATCH V9.1 (All versions), SIMATIC NET PC Software V14 (All versions), SIMATIC NET PC Software V15 (All versions), SIMATIC NET PC Software V16 (All versions < V16 Update 6), SIMATIC NET PC Software V17 (All versions < V17 SP1), SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC Route Control V8.2 (All versions), SIMATIC Route Control V9.0 (All versions), SIMATIC Route Control V9.1 (All versions), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 5). When downloading files, the affected systems do not properly neutralize special elements within the pathname. An attacker could then cause the pathname to resolve to a location outside of the restricted directory on the server and read unexpected critical files.

Frequently asked questions

What is CVE-2021-40359?: A vulnerability has been identified in OpenPCS 7 V8.2 (All versions), OpenPCS 7 V9.0 (All versions < V9.0 Upd4), OpenPCS 7 V9.1 (All versions), SIMATIC BATCH V8.2 (All versions), SIMATIC BATCH V9.0 (All versions), SIMATIC BATCH V9.1 (All versions), SIMATIC NET PC Software V14 (All versions), SIMATIC NET PC Software V15 (All versions), SIMATIC NET PC Software V16 (All versions < V16 Update 6), SIMATIC NET PC Software V17 (All versions < V17 SP1), SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC Route Control V8.2 (All versions), SIMATIC Route Control V9.0 (All versions), SIMATIC Route Control V9.1 (All versions), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 5). When downloading files, the affected systems do not properly neutralize special elements within the pathname. An attacker could then cause the pathname to resolve to a location outside of the restricted directory on the server and read unexpected critical files.
How severe is CVE-2021-40359?: CVE-2021-40359 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-40359 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40359?: CVE-2021-40359 primarily affects Siemens Simatic Batch. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-40359?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-40359 published?: CVE-2021-40359 was published on 2021-11-09 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf

Affected products (38)

cpe:2.3:a:siemens:simatic_batch:8.2:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:8.2:upd_9:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.0:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.0:sp1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_4:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_batch:9.1:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_net_pc:14:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_net_pc:15:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_net_pc:16:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_net_pc:16:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_net_pc:17:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_route_control:8.2:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_route_control:9.0:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_route_control:9.1:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp1_update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp1_update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update4:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:15:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:16:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:16:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:16:update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:16:update3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:16:update4:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:17:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:17:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simaticpcs_7:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simaticpcs_7:9.1:-:*:*:*:*:*:*

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