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CVE Record

CVE-2018-11315: The Local HTTP API in Radio Thermostat CT50 and CT80 1.04.84 and below products allows unauthorized access...

The Local HTTP API in Radio Thermostat CT50 and CT80 1.04.84 and below products allows unauthorized access via a DNS rebinding attack. This can result in remote device temperature control, as demonstrated by a tstat t_heat request that accesses a device purchased in the Spring of 2018, and sets a home's target temperature to 95 degrees Fahrenheit. This vulnerability might be described as an addendum to CVE-2013-4860.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue lets a malicious website reach certain Radio Thermostat CT50 and CT80 devices through a victim's browser and change thermostat settings without authorization. The public description shows unwanted temperature control. Business impact is mainly loss of control over environmental systems, occupant comfort, and operational disruption where these devices remain deployed.

Executive priority

Treat this as a targeted IoT exposure issue, not a broad enterprise emergency. Prioritize environments where thermostat manipulation affects safety, operations, regulated spaces, or customer-facing facilities. If devices are unsupported or unmanaged, remediation should include replacement planning.

Technical view

CVE-2018-11315 affects the Local HTTP API in Radio Thermostat CT50 and CT80 firmware 1.04.84 and below. The weakness is unauthorized local API access through DNS rebinding, described as related to CVE-2013-4860. The source bundle does not provide CVSS, CWE, vendor patch details, or a confirmed remediation version.

Likely exposure

Exposure is most likely in homes, offices, or small facilities using CT50 or CT80 thermostats on firmware 1.04.84 or below. The device does not need to be directly internet-facing if a user's browser can be used to reach the private network device.

Exploitation context

Public research and media coverage describe DNS rebinding against private-network devices, including a demonstrated thermostat temperature change. The CVE is not listed as KEV in the bundle, so there is no source-grounded evidence here of active exploitation in the wild.

Researcher notes

The affected surface is the local HTTP API and the attack class is DNS rebinding. Sources identify models and firmware ceiling but not CVSS, CWE, patch status, or exploit prevalence. Avoid expanding scope beyond CT50 and CT80 firmware 1.04.84 and below without vendor evidence.

Mitigation direction

  • Inventory CT50 and CT80 thermostats and record firmware versions.
  • Check Radio Thermostat or device vendor guidance for firmware or configuration fixes.
  • Restrict user-device network access to thermostat management interfaces.
  • Place thermostats on isolated IoT or facilities-management networks.
  • Monitor for unexpected thermostat setting changes or repeated local API access.
  • Replace unsupported devices if no vendor remediation is available.

Validation and detection

  • Confirm whether CT50 or CT80 devices are present in asset records.
  • Verify firmware is 1.04.84 or below before marking affected.
  • Review network paths from user browsing devices to thermostat HTTP interfaces.
  • Check whether vendor guidance identifies a fixed firmware or compensating control.
  • Validate segmentation blocks ordinary user subnets from thermostat management APIs.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2018-11315 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.