No exploitation reportedFix available

CVE-2021-40359

Q: Is CVE-2021-40359 actively exploited?

Active exploitation of CVE-2021-40359 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-40359?

CVE-2021-40359 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

No exploitation reported by the sources we read.

Published2021-11-09
WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2021-11-0912:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-40359?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-40359?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens simatic wincc

Branch	Affected	Fixed in	Source
7.4	≤ 7.4	no fix published	NVD
7.5	= 7.5	no fix published	NVD
15.x	= 15	no fix published	NVD
16.x	= 16	no fix published	NVD
17.x	= 17	no fix published	NVD

Siemens simatic net pc

Branch	Affected	Fixed in	Source
14.x	= 14	no fix published	NVD
15.x	= 15	no fix published	NVD
16.x	= 16	no fix published	NVD
17.x	= 17	no fix published	NVD

Siemens simatic batch

Branch	Affected	Fixed in	Source
8.2	= 8.2	no fix published	NVD
9.0	= 9.0	no fix published	NVD
9.1	= 9.1	no fix published	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-315-03 CISA21 known affected
Siemens SIMATIC WinCC (Update E)
OpenPCS 7 V8.2 · OpenPCS 7 V9.0 · OpenPCS 7 V9.1 · +18 more

Full record on NVD

Fix

Vendor fix CISA ICSA-21-315-03 · 1 productUpdate to V8.2 SP1; then update SIMATIC WinCC to V7.4 SP1 Update 19 or later version to fix CVE-2021-40358 and CVE-2021-40364
Vendor fix CISA ICSA-21-315-03 · 1 productUpdate to V15 SP1 Update 7 or later version
Vendor fix CISA ICSA-21-315-03 · 1 productUpdate to V16 Update 5 or later version
Vendor fix CISA ICSA-21-315-03 · 1 productUpdate to V17 Update 2 or later version
Vendor fix CISA ICSA-21-315-03 · 1 productUpdate to V7.4 SP1 Update 19 or later version
Vendor fix CISA ICSA-21-315-03 · 1 productUpdate to V7.5 SP2 Update 5 or later version

Advisories and patches

cert-portal.siemens.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.17.7read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-22read 2026-10-23
NVDweakness (CWE)CWE-22read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2021-11-09
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-40359?

Is CVE-2021-40359 actively exploited?

Active exploitation of CVE-2021-40359 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-40359?

CVE-2021-40359 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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