SIMATIC CN 4100: Out-of-bounds Read
CVE-2025-47219 is a high-severity out-of-bounds read vulnerability in SIMATIC CN 4100 from Siemens, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version V5.0 as the first without the flaw, so updating SIMATIC CN 4100 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.77% chance of exploitation within 30 days, higher than 56% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update SIMATIC CN 4100 to V5.0 or a later version.
- Update Gstreamer to 1.26.2 or a later version.
- Read the advisory on gstreamer.freedesktop.org for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | SIMATIC CN 4100 | before V5.0 | V5.0 |
| Gstreamer | Gstreamer | before 1.26.2 | 1.26.2 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
In GStreamer through 1.26.1, the isomp4 plugin's qtdemux_parse_trak function may read past the end of a heap buffer while parsing an MP4 file, possibly leading to information disclosure.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Technical write-ups (may include proof of concept)
- github.com/atredispartners/advisories/blob/master/2025/ATREDIS-2025-0003.mdExploit, Third Party Advisory
Other references
Other vulnerabilities in SIMATIC CN 4100
- 7.5 High severity
- 9.1 Critical severity
- 7.8 High severity
- 7.5 High severity
- 9.8 Critical severity
- 7.5 High severity
Recent Out-of-bounds Read vulnerabilities
- 9.8 Critical severity
- 7.8 High severity
- 7.5 High severity
- 7.5 High severity
- 9.1 Critical severity
- 7.1 High severity
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