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Fencer Vulns
medium 6.2

CVE-2023-50821 json

A vulnerability has been identified in SIMATIC PCS 7 V9.1 (All versions < V9.1 SP2 UC04), SIMATIC WinCC Runtime Professional V17 (All versi…

published 2024-04-09 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-55554

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC PCS 7 V9.1 (All versions < V9.1 SP2 UC04), SIMATIC WinCC Runtime Professional V17 (All versions < V17 Update 8), SIMATIC WinCC Runtime Professional V18 (All versions < V18 Update 4), SIMATIC WinCC Runtime Professional V19 (All versions < V19 Update 1), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 16), SIMATIC WinCC V8.0 (All versions < V8.0 Update 5). The affected products do not properly validate the input provided in the login dialog box. An attacker could leverage this vulnerability to cause a persistent denial of service condition.

Patch / fix

  • Siemens SIMATIC PCS 7 V9.1 V9.1 SP2 UC04
  • Siemens SIMATIC WinCC Runtime Professional V17 V17 Update 8
  • Siemens SIMATIC WinCC Runtime Professional V18 V18 Update 4
  • Siemens SIMATIC WinCC Runtime Professional V19 V19 Update 1
  • Siemens SIMATIC WinCC V7.5 V7.5 SP2 Update 16
  • Siemens SIMATIC WinCC V8.0 V8.0 Update 5

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-24-102-02 updated cvss 6.2

Siemens SIMATIC WinCC

  • Siemens SIMATIC PCS 7 V9.1 <V9.1_SP2_UC04
    affected: fixed in V9.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC WinCC Runtime Professional V17 <V17_Update_8
    affected: fixed in V17, mitigation
  • Siemens SIMATIC WinCC Runtime Professional V18 <V18_Update_4
    affected: fixed in V18, mitigation
  • Siemens SIMATIC WinCC Runtime Professional V19 <V19_Update_1
    affected: fixed in V19, mitigation
  • Siemens SIMATIC WinCC V7.5 <V7.5_SP2_Update_16
    affected: fixed in V7.5, mitigation support.industry.siemens.com
  • Siemens SIMATIC WinCC V8.0 <V8.0_Update_5
    affected: fixed in V8.0, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 6.9 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Siemens SIMATIC PCS 7 V9.1
  • Siemens SIMATIC WinCC Runtime Professional V17
  • Siemens SIMATIC WinCC Runtime Professional V18
  • Siemens SIMATIC WinCC Runtime Professional V19
  • Siemens SIMATIC WinCC V7.5
  • Siemens SIMATIC WinCC V8.0

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.