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Fencer Vulns
medium 5.9

CVE-2023-28827 json

A vulnerability has been identified in SIMATIC CP 1242-7 V2 (incl.

published 2024-09-10 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32459

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC CP 1242-7 V2 (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-1 (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-7 LTE (All versions < V3.5.20), SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) (All versions < V3.5.20), SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions), SIMATIC IPC DiagBase (All versions), SIMATIC IPC DiagMonitor (All versions), SIMATIC WinCC Runtime Advanced (All versions), SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) (All versions < V2.4.8), TIM 1531 IRC (6GK7543-1MX00-0XE0) (All versions < V2.4.8). The web server of the affected devices do not properly handle certain requests, causing a timeout in the watchdog, which could lead to the clean up of pointers.

This could allow a remote attacker to cause a denial of service condition in the system.

Patch / fix

  • Siemens SIMATIC CP 1242-7 V2 (incl. SIPLUS variants) V3.5.20
  • Siemens SIMATIC CP 1243-1 (incl. SIPLUS variants) V3.5.20
  • Siemens SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) V3.5.20
  • Siemens SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) V3.5.20
  • Siemens SIMATIC CP 1243-7 LTE V3.5.20
  • Siemens SIMATIC CP 1243-8 IRC V3.5.20
  • Siemens SIPLUS TIM 1531 IRC V2.4.8
  • Siemens TIM 1531 IRC V2.4.8

Vendor advisories

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

cisa ICSA-24-256-09 updated cvss 5.9

Siemens SIMATIC, SIPLUS, and TIM

  • Siemens SIMATIC CP 1242-7 V2 (incl. SIPLUS variants) <V3.5.20 Siemens SIMATIC CP 1243-1 (incl. SIPLUS variants) <V3.5.20 Siemens SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) <V3.5.20 Siemens SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) <V3.5.20 Siemens SIMATIC CP 1243-7 LTE <V3.5.20 Siemens SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) <V3.5.20
    affected: fixed in V3.5.20, workaround support.industry.siemens.com
  • Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants) Siemens SIMATIC IPC DiagBase Siemens SIMATIC IPC DiagMonitor Siemens SIMATIC WinCC Runtime Advanced
    affected: workaround, no fix planned
  • Siemens SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) <V2.4.8 Siemens TIM 1531 IRC (6GK7543-1MX00-0XE0) <V2.4.8
    affected: fixed in V2.4.8, workaround support.industry.siemens.com

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

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:H/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 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Siemens SIMATIC CP 1242-7 V2 (incl. SIPLUS variants)
  • Siemens SIMATIC CP 1243-1 (incl. SIPLUS variants)
  • Siemens SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants)
  • Siemens SIMATIC CP 1243-1 IEC (incl. SIPLUS variants)
  • Siemens SIMATIC CP 1243-7 LTE
  • Siemens SIMATIC CP 1243-8 IRC
  • Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants)
  • Siemens SIMATIC IPC DiagBase
  • Siemens SIMATIC IPC DiagMonitor
  • Siemens SIMATIC WinCC Runtime Advanced
  • Siemens SIPLUS TIM 1531 IRC
  • Siemens TIM 1531 IRC

Classification

Weakness

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.