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.

Published: 2021-11-09 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-40359 is rated Moderate Risk (53.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.14%). Review affected assets and schedule remediation.

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-2021-40359

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 0.41% 1.14% +0.73%
2 2026-04-12 0.47% 0.41% -0.06%
3 2025-11-21 — 0.47% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-40359

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.1 4.0 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [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-2021-40359

Affected software / configurations for CVE-2021-40359

Vendor Product Version Raw CPE
siemens simatic_batch 8.2 cpe:2.3:a:siemens:simatic_batch:8.2:-:*:*:*:*:*:*
siemens simatic_batch 8.2 cpe:2.3:a:siemens:simatic_batch:8.2:upd_9:*:*:*:*:*:*
siemens simatic_batch 9.0 cpe:2.3:a:siemens:simatic_batch:9.0:-:*:*:*:*:*:*
siemens simatic_batch 9.0 cpe:2.3:a:siemens:simatic_batch:9.0:sp1:*:*:*:*:*:*
siemens simatic_batch 9.0 cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_1:*:*:*:*:*:*
siemens simatic_batch 9.0 cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_2:*:*:*:*:*:*
siemens simatic_batch 9.0 cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_3:*:*:*:*:*:*
siemens simatic_batch 9.0 cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_4:*:*:*:*:*:*
siemens simatic_batch 9.1 cpe:2.3:a:siemens:simatic_batch:9.1:-:*:*:*:*:*:*
siemens simatic_net_pc 14 cpe:2.3:a:siemens:simatic_net_pc:14:-:*:*:*:*:*:*
siemens simatic_net_pc 15 cpe:2.3:a:siemens:simatic_net_pc:15:-:*:*:*:*:*:*
siemens simatic_net_pc 16 cpe:2.3:a:siemens:simatic_net_pc:16:-:*:*:*:*:*:*
siemens simatic_net_pc 16 cpe:2.3:a:siemens:simatic_net_pc:16:update1:*:*:*:*:*:*
siemens simatic_net_pc 17 cpe:2.3:a:siemens:simatic_net_pc:17:-:*:*:*:*:*:*
siemens simatic_route_control 8.2 cpe:2.3:a:siemens:simatic_route_control:8.2:*:*:*:*:*:*:*
siemens simatic_route_control 9.0 cpe:2.3:a:siemens:simatic_route_control:9.0:-:*:*:*:*:*:*
siemens simatic_route_control 9.1 cpe:2.3:a:siemens:simatic_route_control:9.1:-:*:*:*:*:*:*
siemens simatic_wincc <= 7.4 cpe:2.3:a:siemens:simatic_wincc:*:*:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:*:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:-:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp1:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp1_update1:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp1_update2:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp2:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update1:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update2:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update3:*:*:*:*:*:*
siemens simatic_wincc 7.5 cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update4:*:*:*:*:*:*
siemens simatic_wincc 15 cpe:2.3:a:siemens:simatic_wincc:15:-:*:*:*:*:*:*
siemens simatic_wincc 16 cpe:2.3:a:siemens:simatic_wincc:16:-:*:*:*:*:*:*
siemens simatic_wincc 16 cpe:2.3:a:siemens:simatic_wincc:16:update1:*:*:*:*:*:*
siemens simatic_wincc 16 cpe:2.3:a:siemens:simatic_wincc:16:update2:*:*:*:*:*:*
siemens simatic_wincc 16 cpe:2.3:a:siemens:simatic_wincc:16:update3:*:*:*:*:*:*
siemens simatic_wincc 16 cpe:2.3:a:siemens:simatic_wincc:16:update4:*:*:*:*:*:*
siemens simatic_wincc 17 cpe:2.3:a:siemens:simatic_wincc:17:-:*:*:*:*:*:*
siemens simatic_wincc 17 cpe:2.3:a:siemens:simatic_wincc:17:update1:*:*:*:*:*:*
siemens simaticpcs_7 <= 8.2 cpe:2.3:a:siemens:simaticpcs_7:*:*:*:*:*:*:*:*
siemens simaticpcs_7 >= 9.0, < 9.1 cpe:2.3:a:siemens:simaticpcs_7:*:*:*:*:*:*:*:*
siemens simaticpcs_7 9.1 cpe:2.3:a:siemens:simaticpcs_7:9.1:-:*:*:*:*:*:*

References for CVE-2021-40359

cvelogic Threat Intelligence