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Shibby Tomato EUVDEUVD-2026-43309

| CVE-2026-15545 HIGH
Out-of-bounds Write (CWE-787)
2026-07-13 VulDB GHSA-x2mq-9fxf-86m4
Memory Corruption Buffer Overflow Tomato
7.4
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
7.4 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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
vuln.today AI
8.8 HIGH

Network-reachable CGI with low complexity and no user interaction, but requires a low-privilege authenticated web session (PR:L); out-of-bounds write yields high C/I/A impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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
Low
User Interaction
None
Scope
X

Lifecycle Timeline

6
Analysis Updated
Jul 13, 2026 - 09:28 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 13, 2026 - 09:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 13, 2026 - 09:22 vuln.today
cvss_changed
CVSS changed
Jul 13, 2026 - 09:22 NVD
8.7 (HIGH) 7.4 (HIGH)
Analysis Generated
Jul 13, 2026 - 09:01 vuln.today
CVE Published
Jul 13, 2026 - 08:00 cve.org
HIGH 8.7

DescriptionCVE.org

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 This project is superseded by FreshTomato.

AnalysisAI

Out-of-bounds write in the Shibby Tomato router firmware (versions up to and including 1.28.0000) lets authenticated remote users corrupt memory through the apcupsd web component. The flaw sits in the main() function of www/apcupsd/tomatodata.cgi, where crafted input reaches an out-of-bounds write (CWE-787) that can crash the CGI or potentially execute code on the router. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach router web UI over network
Delivery
Authenticate with low-privilege credentials
Exploit
Send crafted request to tomatodata.cgi
Execution
Trigger out-of-bounds write in main()
Impact
Corrupt memory / execute code on router
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Vulnerability AssessmentAI

Exploitation Exploitation requires network access to the router's web administration interface AND a low-privilege authenticated session (CVSS PR:L), plus the apcupsd/UPS component being present and reachable so that the www/apcupsd/tomatodata.cgi endpoint can be invoked. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are mixed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a low-privilege authenticated session on the router's web interface - obtained via weak/default credentials, credential reuse, or an exposed management page - sends a crafted request to www/apcupsd/tomatodata.cgi. The malformed parameters trigger the out-of-bounds write in main(), crashing the daemon or corrupting memory to potentially run attacker code on the router. …
Remediation No vendor-released patch identified at time of analysis, and the Shibby Tomato project is end-of-life (superseded by FreshTomato), so the primary remediation is migration: replace Shibby Tomato with an actively maintained firmware such as FreshTomato (or an equivalent supported alternative) that carries current fixes, accepting the effort of a firmware reflash and configuration migration. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, conduct a complete inventory of Shibby Tomato deployments and document all systems running firmware version 1.28.0000 or earlier in production. …

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Same weakness CWE-787 – Out-of-bounds Write

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Same technique Memory Corruption

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EUVD-2026-43309 vulnerability details – vuln.today
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