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Tim 1531 Irc FirmwareOperating system · Siemens

CVE-2018-4841

CRITICAL · 9.8 CVSS v3.1 Published 2018-03-29
Fix available
A fix is available. Upgrade to 1.1 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A vulnerability has been identified in TIM 1531 IRC (All versions < V1.1). A remote attacker with network access to port 80/tcp or port 443/tcp could perform administrative operations on the device without prior authentication. Successful exploitation could allow to cause a denial-of-service, or read and manipulate data as well as configuration settings of the affected device. At the stage of publishing this security advisory no public exploitation is known. Siemens provides mitigations to resolve it.

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 confidence

Authentication bypass vulnerability in Siemens TIM 1531 IRC devices allows remote attackers to perform administrative operations on ports 80/tcp or 443/tcp without any authentication. Successful exploitation enables data manipulation, configuration changes, or denial-of-service against the affected device.

MitigationUpdate TIM 1531 IRC to firmware version V1.1 or later. Additionally, restrict network access to ports 80/tcp and 443/tcp using firewalls or network segmentation to limit exposure to untrusted networks.

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
Tim 1531 Irc FirmwareOperating system
Affected:< 1.1

CVSS 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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device model
    Access the device web interface or use network discovery to confirm the device is a Siemens TIM 1531 IRC. Check the device's web interface login page or system information page for the model designation.
    Affected if The device model is confirmed to be Siemens TIM 1531 IRC.
  2. Check the installed firmware version
    Log into the device web interface and navigate to System Information or Firmware Update section to view the current firmware version. Alternatively, check the device startup banner or configuration file if accessible.
    Affected if The firmware version is displayed as anything less than 1.1 (such as V1.0, earlier versions, or unversioned builds).
  3. Verify port accessibility
    Use a network scanner or simple port check (such as 'nmap -p 80,443 <target>' or 'telnet <target> 80') to confirm that ports 80/tcp and 443/tcp are open and reachable on the device.
    Affected if Ports 80/tcp or 443/tcp are open and accessible from an untrusted network.
  4. Test unauthenticated web access
    Attempt to access the device web interface at http://<device_ip>/ or https://<device_ip>/ without providing any credentials. Navigate to administrative pages such as /config or /admin directly.
    Affected if Administrative pages or device configuration are accessible without requiring login credentials.

A user is affected if they have a TIM 1531 IRC device with firmware version below 1.1 that has ports 80/tcp or 443/tcp exposed, and administrative functions are reachable without authentication.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 1.1 or later
Fixed in 1.1
Interim mitigation

Update TIM 1531 IRC to firmware version V1.1 or later. Additionally, restrict network access to ports 80/tcp and 443/tcp using firewalls or network segmentation to limit exposure to untrusted networks.

Recommended fix High confidence

TIM 1531 IRC Firmware V1.1

  1. 1. Back up the current device configuration and settings before performing any firmware update.
  2. 2. Obtain the TIM 1531 IRC firmware version V1.1 or later from the official Siemens support portal (cert-portal.siemens.com or siemens.com/productcert).
  3. 3. Access the TIM 1531 IRC web interface via HTTPS on port 443/tcp or HTTP on port 80/tcp.
  4. 4. Navigate to the firmware upgrade or system maintenance section of the device management interface.
  5. 5. Upload the V1.1 firmware file and initiate the upgrade process.
  6. 6. Wait for the firmware to be applied and the device to reboot automatically.
  7. 7. After reboot, verify the device is running firmware version V1.1 or later by checking the system information in the web interface.
  8. 8. Restore the previously backed-up configuration if needed, and verify device functionality.

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Tim 1531 Irc Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA2.0 h
11.0 hours of engineering $2,000
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,200.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2018-4841 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data