CVE-2026-15545 in Tomato
Summary
by MITRE • 07/13/2026
A vulnerability was identified in Shibby Tomato up to 1.28.0000. Affected by this vulnerability is the function main of the file www/apcupsd/tomatodata.cgi of the component apcupsd. Such manipulation leads to out-of-bounds write. The attack may be launched remotely. The exploit is publicly available and might be used. This project is superseded by FreshTomato.
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Analysis
by VulDB Data Team • 07/13/2026
This vulnerability resides within the Shibby Tomato firmware version 1.28.0000 and specifically targets the apcupsd component through a critical flaw in the main function of the www/apcupsd/tomatodata.cgi file. The issue manifests as an out-of-bounds write condition that occurs when processing user-supplied input data, creating a potential pathway for arbitrary code execution or system compromise. The vulnerability's remote exploitability means attackers can trigger the flaw without physical access to the device, making it particularly dangerous in networked environments.
The technical implementation of this flaw involves improper bounds checking within the apcupsd component's web interface handler, where input parameters from HTTP requests are directly processed into memory buffers without adequate validation. This allows attackers to craft malicious payloads that can overwrite adjacent memory locations, potentially leading to privilege escalation, denial of service conditions, or complete system takeover. The out-of-bounds write vulnerability aligns with CWE-787, which specifically addresses out-of-bounds write conditions in software systems.
From an operational perspective, this vulnerability represents a significant risk for users running Shibby Tomato firmware, particularly those who expose their devices to remote networks or have enabled web-based management interfaces. The publicly available exploit increases the likelihood of successful attacks, making this vulnerability actionable by threat actors without specialized knowledge or tools. Organizations relying on these routers for network infrastructure may experience service disruption or unauthorized access to their internal networks.
The remediation strategy should prioritize immediate firmware updates to FreshTomato, which has superseded Shibby Tomato and addresses this vulnerability along with other security concerns. Administrators should also implement network segmentation to limit exposure of affected devices, disable unnecessary web interfaces when possible, and monitor for suspicious network activity. Additionally, the vulnerability demonstrates the importance of maintaining current firmware versions and the risks associated with using unsupported software branches, as highlighted in various cybersecurity frameworks including those recommended by nist and cisa for device security management.
The attack surface for this vulnerability extends beyond simple exploitation to include potential lateral movement within networks where compromised devices exist, as outlined in the mitre att&ck framework's lateral movement techniques. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting this specific flaw, particularly in environments where legacy firmware versions persist despite known security risks.