Which versions of Shibby Tomato are affected by EUVD-2026-33347?

Shibby Tomato 1.28 router firmware contains a remote denial-of-service vulnerability in its UPnP daemon that can disable affected network devices without authentication.

How to fix or mitigate EUVD-2026-33347?

Within 24 hours: Inventory all Shibby Tomato 1.28 instances in your network and document their criticality. Within 7 days: Procure and validate FreshTomato firmware (the active upstream successor) in a test environment and develop a migration schedule for production devices. Within 30 days: Complete firmware migration to FreshTomato on all affected devices, or implement firewall rules blocking UDP port 1900 and TCP 2869 (UPnP services) at your network perimeter if immediate migration is not feasible.

Shibby Tomato EUVD-2026-33347

Q: What is the CVSS score of EUVD-2026-33347?

EUVD-2026-33347 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

| CVE-2026-10069 HIGH

Uncontrolled Resource Consumption (CWE-400)

2026-05-29 cna@vuldb.com

GHSA-55h4-63gw-7vcm

Denial Of Service

8.7

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

May 29, 2026 - 16:46 vuln.today

DescriptionCVE.org

A vulnerability has been found in Shibby Tomato 1.28. The impacted element is an unknown function of the file usr/sbin/miniupnpd. Such manipulation leads to resource consumption. The attack may be launched remotely. This project is superseded by FreshTomato. This vulnerability only affects products that are no longer supported by the maintainer.

AnalysisAI

Remote denial-of-service in Shibby Tomato 1.28 firmware allows unauthenticated network attackers to exhaust resources via the miniupnpd UPnP daemon at usr/sbin/miniupnpd. The affected project is end-of-life and superseded by FreshTomato, meaning no upstream fix will be issued. No public exploit identified at time of analysis, but the CVSS 4.0 score of 8.7 reflects high availability impact with no authentication or user interaction required.

Technical ContextAI

Shibby Tomato is a community-maintained fork of the Tomato router firmware for consumer SOHO routers, now discontinued in favor of FreshTomato. The vulnerable component, miniupnpd, is the MiniUPnP daemon that implements UPnP IGD and NAT-PMP services typically exposed on the LAN interface to allow LAN clients to request port mappings on the router. CWE-400 (Uncontrolled Resource Consumption) indicates the daemon fails to properly bound memory, CPU, connection, or mapping-table usage when processing crafted requests, allowing an attacker to drive the process or device into exhaustion. Because miniupnpd often runs as a privileged long-lived service on the router, its degradation directly impacts routing and NAT functionality for all clients behind the device.

RemediationAI

No vendor-released patch identified at time of analysis, and none will be issued because Shibby Tomato is end-of-life. The primary remediation is to migrate affected routers to the actively maintained FreshTomato successor firmware (https://freshtomato.org), which inherits and continues development of the Tomato codebase and should be reviewed to confirm whether its bundled miniupnpd is a newer, fixed version. As compensating controls until migration, disable the UPnP/NAT-PMP service entirely in the router's administrative interface (trade-off: LAN applications such as gaming consoles, BitTorrent, and some VoIP clients that rely on automatic port mapping will need manual port forwarding); ensure miniupnpd is not bound to the WAN interface (trade-off: none for typical deployments, as WAN-side UPnP is already considered insecure); and segment untrusted LAN devices such as IoT onto a separate VLAN that cannot reach the router's UPnP listener (trade-off: increased network configuration complexity). Track the issue via https://vuldb.com/vuln/367155 for any further disclosure details.