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Critical

Authentication Bypass and Information Disclosure in Siemens TeleControl Server Basic V3.1.2.2–V3.1.2.3

IdentifiersCVE-2025-40765CWE-306· Missing Authentication for…

CVE-2025-40765 is a critical vulnerability in Siemens TeleControl Server Basic V3.1 (all versions >= V3.1.2.2 and < V3.1.2.3) due to missing authentication for a critical function (CWE-306). This flaw allows unauthenticated remote attackers to obtain password hashes of users and subsequently log in to perform authenticated operations on the database service. The vulnerability is remotely exploitable, requires no privileges or user interaction, and is associated with attack patterns such as message identifier manipulation and communication channel manipulation. Proof-of-concept exploits may be available, increasing the risk of exploitation.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows unauthenticated remote attackers to obtain user password hashes, which can be used to gain unauthorized access to the database service and perform authenticated operations. This can lead to compromise of sensitive information, unauthorized modification of data, and potentially further lateral movement within affected industrial control environments. The vulnerability is rated critical with a CVSS v3.1 score of 9.8 and a CVSS v4.0 score of 9.3.

Mitigation

If you can’t patch tonight, do this now.

Restrict network access to port 8000 to trusted IP addresses only. Minimize network exposure of control system devices, use firewalls to isolate critical systems, and employ secure remote access methods such as up-to-date VPNs. Disable unnecessary services and monitor for unauthorized database activity. Follow Siemens’ Industrial Security guidelines and operational best practices.

Remediation

Patch, then assume compromise.

Upgrade TeleControl Server Basic to version V3.1.2.3 or later, as this release addresses the missing authentication flaw. Siemens also recommends reviewing all user accounts, resetting any potentially compromised passwords, and monitoring the database for unauthorized access. Refer to Siemens ProductCERT Security Advisory SSA-062309 for further details.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
SiemensTelecontrol Server Basicapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

3 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2025-40765
NVD
nvd.nist.gov/vuln/detail/CVE-2025-40765
MITRE CWE · CWE-306
Missing Authentication for Critical Function
Vendor Advisory
cert-portal.siemens.com/productcert/html/ssa-062309.html