CVE-2025-27493
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been identified in SiPass integrated AC5102 (ACC-G2) (All versions < V6.4.9), SiPass integrated ACC-AP (All versions < V6.4.9). Affected devices improperly sanitize user input for specific commands on the telnet command line interface. This could allow an authenticated local administrator to escalate privileges by injecting arbitrary commands that are executed with root privileges.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCommand injection vulnerability in SiPass integrated access control devices (AC5102 and ACC-AP) allows authenticated local administrators to inject arbitrary commands via the telnet CLI that execute with root privileges due to improper input sanitization.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 6.4.9< 6.4.9CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the SiPass device modelAccess the device admin interface or check the physical device label for model number AC5102 or ACC-APAffected if The device is a Siemens SiPass integrated AC5102 or ACC-AP access controller
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Check the installed firmware versionLog into the device administrative interface and navigate to System Information or firmware settings to view the current firmware version; compare against 6.4.9Affected if The firmware version is below 6.4.9 (e.g., 6.4.8, 6.4.7, etc.)
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Determine if telnet CLI is enabledCheck the device network services configuration or run a port scan against the device to detect open telnet port (TCP 23)Affected if Telnet service is enabled and port 23 is accessible on the device
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Assess telnet access exposureReview network access controls, firewall rules, or ACLs to determine if telnet interface is reachable from untrusted networks or external IP rangesAffected if Telnet CLI is accessible from networks beyond trusted administrative subnets
You are affected if you have a SiPass AC5102 or ACC-AP device running firmware below version 6.4.9 with telnet enabled and accessible to untrusted users.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped6.4.9
Upgrade to SiPass integrated firmware version V6.4.9 or later; if immediate upgrade is not possible, restrict telnet access to trusted administrative personnel only.
V6.4.9
- Identify the current firmware version of the SiPass integrated AC5102 (ACC-G2) or ACC-AP device
- Download the V6.4.9 firmware update from the official Siemens cert-portal.siemens.com or Siemens product support website
- Review the firmware upgrade instructions specific to your device model
- Apply the firmware update to the affected device(s)
- After upgrade, verify the device is running firmware version 6.4.9 or later
- Confirm the telnet service is properly configured post-upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27493 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27493 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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