CVE-2025-40796: A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions

Q: How do I fix CVE-2025-40796?

simatic pcs neo: downgrade or apply the listed mitigation; user management component: upgrade to 2.15.1.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-40796 being exploited?

CVE-2025-40796 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-40796 affect?

CVE-2025-40796 affects simatic pcs neo, user management component. Severity is high (CVSS 7.5). A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected p

Q: How urgent is CVE-2025-40796?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEDOWNGRADEUPGRADE

CVE-2025-40796 is a high-severity flaw (CVSS 7.5) affecting simatic pcs neo, user management component. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a out-of-bounds read vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to cause a denial of service condition.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-125
Published	2025-09-09
Last modified	2026-10-23

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

2025-09-09 09:15 UTCPublished CVE record published
2026-10-23 22:10 UTCUpdated Record last modified

siemens simatic pcs neo DOWNGRADE

Affected: 4.1 · 5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1

1. Check installed version

apt-cache policy simatic-pcs-neo || rpm -q simatic-pcs-neo || simatic-pcs-neo --version

2. No fixed release: DOWNGRADE to a release before 4.1 (Debian / Ubuntu)

apt-cache madison simatic-pcs-neo sudo apt install simatic-pcs-neo=<VERSION_BEFORE_4.1> sudo apt-mark hold simatic-pcs-neo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simatic-pcs-neo sudo dnf downgrade simatic-pcs-neo-<VERSION_BEFORE_4.1> sudo dnf versionlock add simatic-pcs-neo

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.

siemens user management component UPGRADE

Affected: < 2.15.1.3

Fixed in: 2.15.1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy user-management-component || rpm -q user-management-component || user-management-component --version

2. UPGRADE to 2.15.1.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade user-management-component

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade user-management-component

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source

sudo dnf upgrade --advisory=FEDORA-2026-95888f332b

Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source

sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273

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-2025-40796?

simatic pcs neo: downgrade or apply the listed mitigation; user management component: upgrade to 2.15.1.3. Exact commands for each OS are on this page.

Is CVE-2025-40796 being exploited?

CVE-2025-40796 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-2025-40796 affect?

CVE-2025-40796 affects simatic pcs neo, user management component. Severity is high (CVSS 7.5). A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected p

How urgent is CVE-2025-40796?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-40795 CRITICAL 9.8 DOWNGRADE UPGRADE A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions
CVE-2025-40797 HIGH 7.5 DOWNGRADE UPGRADE A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions
CVE-2025-40798 HIGH 7.5 DOWNGRADE UPGRADE A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions

References

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