CVE-2026-54429Disclosure

LOWCVSS 6.0 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A vulnerability has been identified in SIMATIC S7-PLCSIM Advanced (All versions). Affected devices do not properly handle high-volume multicast network traffic, which can exhaust available memory resources in the affected application. This could allow an unauthenticated attacker on the local network segment to cause a denial-of-service condition of the affected application. The affected application becomes inaccessible and requires a manual restart; no project data is lost. Successful exploitation requires a specific project configuration to be already active on the targeted instance.

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0.5/ 10 priority

Sources & remediation

Other references

https://cert-portal.siemens.com/productcert/html/ssa-828211.html

Weakness type (CWE)

CWE-770

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

Patch or workaround signal is available
4 mentions across 2 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 3 signals
Disclosure: 2 classified signals
General: 2 classified signals
Peaked 1d ago at 2 mentions (2026-07-14); latest day: 2
4 total mentions across 2 days

Deep dive

Activity timeline4 mentions / 2d

Signal classification2 categories

Disclosure

250.0%

General

250.0%

Referenced assets4 URLs

By indicator

Full discourse4 posts

Aviatrix Threat Research Center@aviatrixtrc77d
General
TRC analysis shows attackers can exploit CVE-2026-54429 to crash Siemens SIMATIC S7-PLCSIM Advanced systems using unauthenticated multicast traffic floods. The vulnerability causes memory exhaustion, making industrial simulation environments inaccessible until manual restart. Network segmentation helps limit exposure to such local segment attacks. #CloudSecurity 🔗 Full TRC analysis: https://aviatrix.ai/threat-research-center/icsa-26-209-03-cve-2026-54429
Post summary
The analysis describes how attackers can exploit CVE-2026-54429 to crash Siemens SIMATIC systems via multicast traffic floods and suggests network segmentation as a mitigation, but no functional exploit or patch information is provided.
0000067
1.9K followersView on X
Windows Forum@windowsforum77d
Disclosure
🚨 Siemens PLCSIM Advanced has a high-severity DoS affecting every version—and no fix yet. One flood of multicast traffic can knock out industrial simulations. Patch Tuesday can’t come soon enough. https://windowsforum.com/security-alerts.84/cve-2026-54429-siemens-plcsim-dos-has-no-fix-yet.440736/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #IndustrialCybersecurity #SiemensSimatic #S7PlcsimAdvanced https://t.co/V0qtSpMxVr
Post summary
The post announces a high‑severity DoS vulnerability (CVE‑2026‑54429) impacting all versions of Siemens PLCSIM Advanced, with no patch available yet.
0000040
1.3K followersView on X
CVE@CVEnew91d
General
CVE-2026-54429 A vulnerability has been identified in SIMATIC S7-PLCSIM Advanced (All versions). Affected devices do not properly handle high-volume multicast network traffic, which… https://www.cve.org/CVERecord?id=CVE-2026-54429
Post summary
The post announces a vulnerability in all versions of SIMATIC S7-PLCSIM Advanced that mishandles high-volume multicast traffic, but provides no proof of concept, exploit code, active exploitation evidence, or mitigation guidance.
00000696
57.8K followersView on X
MalwareObserver@MalwareObserver91d
Disclosure
🐛 VULNERABILITIES CVE Notify: 🚨 [CVE-2026-54429](https://cert-portal.siemens.com/productcert/html/ssa-828211.html) A vulnerabilit... https://cert-portal.siemens.com/productcert/html/ssa-828211.html #Vulnerability #CVE #ZeroDay
Post summary
The post announces CVE-2026-54429 as a zero‑day vulnerability but provides no further technical details, exploitation evidence, or remediation information.
0000035
11 followersView on X

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What researchers are saying

CVE-2026-54429

Aviatrix Threat Research Center[verified]@aviatrixtrcGeneral

The analysis describes how attackers can exploit CVE-2026-54429 to crash Siemens SIMATIC systems via multicast traffic floods and suggests network segmentation as a mitigation, but no functional exploit or patch information is provided.

Windows Forum[verified]@windowsforumDisclosure

The post announces a high‑severity DoS vulnerability (CVE‑2026‑54429) impacting all versions of Siemens PLCSIM Advanced, with no patch available yet.

MalwareObserver[verified]@MalwareObserverDisclosure

The post announces CVE-2026-54429 as a zero‑day vulnerability but provides no further technical details, exploitation evidence, or remediation information.

CVE@CVEnewGeneral

The post announces a vulnerability in all versions of SIMATIC S7-PLCSIM Advanced that mishandles high-volume multicast traffic, but provides no proof of concept, exploit code, active exploitation evidence, or mitigation guidance.