CVE-2025-27539

CVE-2025-27539 is a critical-severity vulnerability in Siemens Telecontrol Server Basic with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Description

A vulnerability has been identified in TeleControl Server Basic (All versions < V3.1.2.2). The affected application is vulnerable to SQL injection through the internally used 'VerifyUser' method. This could allow an unauthenticated remote attacker to bypass authorization controls, to read from and write to the application's database and execute code with "NT AUTHORITY\NetworkService" permissions. A successful attack requires the attacker to be able to access port 8000 on a system where a vulnerable version of the affected application is executed on. (ZDI-CAN-25914)

Frequently asked questions

What is CVE-2025-27539?
A vulnerability has been identified in TeleControl Server Basic (All versions < V3.1.2.2). The affected application is vulnerable to SQL injection through the internally used 'VerifyUser' method. This could allow an unauthenticated remote attacker to bypass authorization controls, to read from and write to the application's database and execute code with "NT AUTHORITY\NetworkService" permissions. A successful attack requires the attacker to be able to access port 8000 on a system where a vulnerable version of the affected application is executed on. (ZDI-CAN-25914)
How severe is CVE-2025-27539?
CVE-2025-27539 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-27539 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27539?
CVE-2025-27539 affects Siemens Telecontrol Server Basic. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27539?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-27539 have an EU (EUVD) identifier?
Yes. CVE-2025-27539 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11450.
When was CVE-2025-27539 published?
CVE-2025-27539 was published on 2025-04-16 and last updated on 2026-06-17.

References

Affected products (1)

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