Out-of-Bounds Write Vulnerability in Shibby Tomato Router Firmware
CVE-2026-15545

8.7HIGH

Key Information:

Vendor

Shibby

Status
Tomato
Vendor
CVE Published:
13 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-15545?

A significant out-of-bounds write vulnerability has been discovered in the Shibby Tomato firmware, specifically affecting the apcupsd component found in the file www/apcupsd/tomatodata.cgi. This flaw resides within the main function, allowing attackers to manipulate the flow of data, potentially leading to unauthorized memory writes. Since the exploitation can be executed remotely and the relevant exploit code is publicly accessible, it poses a considerable risk to users of the affected versions. Awareness and prompt remediation measures are essential for safeguarding your systems, as the project is now superseded by FreshTomato.

Affected Version(s)

Tomato 1.0

Tomato 1.1

Tomato 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-15545 - Proof of Concept

References

https://vuldb.com/vuln/377895
vdb-entrytechnical-description
https://vuldb.com/vuln/377895/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-15545
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

VulDB Gitee Analyzer
VulDB CNA Team
.