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CVE-2025-40765: A vulnerability has been identified in TeleControl Server Basic V3.1 (All versions >= V3.1.2.2 < V3.1.2.3)

50
This month
CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-40765 is a critical-severity flaw (CVSS 9.8) affecting telecontrol server basic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been identified in TeleControl Server Basic V3.1 (All versions >= V3.1.2.2 < V3.1.2.3). The affected application contains an information disclosure vulnerability. This could allow an unauthenticated remote attacker to obtain password hashes of users and to login to and perform authenticated operations of the database service.

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 56%)
CISA exploited listNo
WeaknessCWE-306
Published2025-10-14
Last modified2026-10-23
Publisher (CNA): Siemens AG · Vendor: siemens

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

siemens telecontrol server basic DOWNGRADE
Affected: 3.1.2.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.1.2.2
1. Check installed version
apt-cache policy telecontrol-server-basic || rpm -q telecontrol-server-basic || telecontrol-server-basic --version
2. No fixed release: DOWNGRADE to a release before 3.1.2.2 (Debian / Ubuntu)
apt-cache madison telecontrol-server-basic sudo apt install telecontrol-server-basic=<VERSION_BEFORE_3.1.2.2> sudo apt-mark hold telecontrol-server-basic
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list telecontrol-server-basic sudo dnf downgrade telecontrol-server-basic-<VERSION_BEFORE_3.1.2.2> sudo dnf versionlock add telecontrol-server-basic
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · python-streamlink · FIXED · 8.6.2-1.fc46 · FEDORA-2026-a56fcfdc08 · source
sudo dnf upgrade --advisory=FEDORA-2026-a56fcfdc08
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-40765?

telecontrol server basic: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-40765 being exploited?

CVE-2025-40765 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-40765 affect?

CVE-2025-40765 affects telecontrol server basic. Severity is critical (CVSS 9.8). A vulnerability has been identified in TeleControl Server Basic V3.1 (All versions >= V3.1.2.2 < V3.1.2.3). The affected application contains an information disclosure vulnerability. This could allow an unauthenticated remote attacker to ob

How urgent is CVE-2025-40765?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

References

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