CVE-2026-15570 Overview
CVE-2026-15570 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] in the SmartCenter browserseturl command on the Telefunken TE24553B45V2DZ Smart TV. The affected device runs on the Vestel MB181 / Voltron181 / TiVo OS platform. The vulnerability stems from improper restriction of URL schemes and destinations. An attacker on the same local network can force the embedded browser to issue requests to loopback and internal destinations, including 127.0.0.1 addresses. Demonstrated scenarios show requests reaching internal services and receiving successful responses, even when the same destinations are unreachable through normal browser navigation. The issue affects firmware version V2.78.0.0 and is fixed in firmware version V2.85.2.0.
Critical Impact
Adjacent network attackers can pivot through the Smart TV's embedded browser to reach internal loopback services otherwise inaccessible to external navigation.
Affected Products
- Telefunken TE24553B45V2DZ Smart TV
- Vestel MB181 / Voltron181 platform
- Firmware version V2.78.0.0 running on TiVo OS
Discovery Timeline
- 2026-08-07 - CVE-2026-15570 published to NVD
- 2026-08-07 - Last updated in NVD database
Technical Details for CVE-2026-15570
Vulnerability Analysis
The vulnerability resides in the SmartCenter browserseturl command, which drives navigation of the TV's embedded browser. The command accepts URL inputs without adequately validating the scheme or the destination host. An adjacent-network attacker can invoke browserseturl with URLs pointing at loopback addresses such as 127.0.0.1 or other internal endpoints. The embedded browser then issues the request using the TV's own network context. This bypasses the boundary that normally prevents external navigation to internal services. In demonstrated cases, internal services returned successful responses to these attacker-directed requests. The attack requires no authentication or user interaction and can be launched by any host sharing the local network with the vulnerable TV.
Root Cause
The underlying flaw is a missing allowlist for permitted URL schemes and destination hosts in the browserseturl command handler. The command trusts caller-supplied URLs and does not filter loopback ranges, link-local addresses, or internal RFC1918 destinations. This is a classic SSRF pattern captured by [CWE-918].
Attack Vector
Exploitation requires an adjacent network position. The attacker sends a crafted SmartCenter browserseturl request specifying a target URL such as http://127.0.0.1:<port>/<path>. The TV's embedded browser fetches the URL from its privileged local context. Because the request originates from the device itself, it can reach services bound to loopback interfaces. Consult the Vestel Security Advisory Document for the vendor's technical description.
Detection Methods for CVE-2026-15570
Indicators of Compromise
- Unexpected inbound SmartCenter protocol traffic to the TV from other hosts on the LAN.
- Local HTTP requests observed against loopback services on the TV originating from the embedded browser process.
- Outbound TV traffic patterns that deviate from normal streaming and application behavior.
Detection Strategies
- Inspect LAN traffic for SmartCenter command traffic containing URLs referencing 127.0.0.1, localhost, or RFC1918 ranges targeted at the TV.
- Baseline the TV's normal network destinations and alert on deviations toward internal management interfaces.
- Correlate device firmware version telemetry against the vulnerable V2.78.0.0 build.
Monitoring Recommendations
- Segment IoT and Smart TV devices onto isolated VLANs and log all cross-segment attempts.
- Capture and retain DHCP, ARP, and flow data to identify adjacent-network hosts interacting with the TV.
- Monitor for repeated SmartCenter command invocations from a single LAN endpoint.
How to Mitigate CVE-2026-15570
Immediate Actions Required
- Upgrade affected Telefunken TE24553B45V2DZ Smart TVs to firmware V2.85.2.0 or later.
- Identify all Vestel MB181 / Voltron181 / TiVo OS devices in the environment and inventory their firmware versions.
- Restrict the TV to a dedicated network segment with no route to sensitive internal services.
Patch Information
Vestel has released firmware version V2.85.2.0, which remediates the improper URL scheme and destination handling in the SmartCenter browserseturl command. Refer to Vestel International Security Advisories for release notes and rollout guidance.
Workarounds
- Place vulnerable TVs on an isolated VLAN that cannot reach internal management or application services.
- Block untrusted hosts on the local network from reaching the TV's SmartCenter listening ports using switch ACLs or a local firewall.
- Disable Smart TV network features when not required for operational use.
# Example VLAN isolation using switch ACL syntax (illustrative)
access-list 150 deny ip any host <smart-tv-ip>
access-list 150 permit ip any any
interface Vlan10
description IoT-Smart-TV-Segment
ip access-group 150 in
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
