Authenticated memory corruption via unbounded Field copy
Published Jul 13, 2026 · Updated Jul 13, 2026
Stack-based buffer overflow in Shibby Tomato 1.28.0000 and earlier allows remote authenticated users to corrupt the apcupsd CGI process. The tomatodata.cgi getupsvar function copies attacker-controlled Field data into a fixed-size stack buffer without enforcing its bound. APCUPSD is disabled by default; an authenticated session, CGI access, and an enabled daemon are required to crash or control the process.
Summary
What happened
Stack-based buffer overflow in Shibby Tomato 1.28.0000 and earlier allows remote authenticated users to corrupt the apcupsd CGI process. The tomatodata.cgi getupsvar function copies attacker-controlled Field data into a fixed-size stack buffer without enforcing its bound. APCUPSD is disabled by default; an authenticated session, CGI access, and an enabled daemon are required to crash or control the process.
The record
- CVE
- CVE-2026-15544
- Published
- Jul 13, 2026
- Updated
- Jul 13, 2026
- Vendor
- Shibby
- Product
- Tomato
- Classifications
- CWE-119, CWE-121, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 13, 2026CVE publishedPublication date reported by the CVE source.
- Jul 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0
- Affected versionversion=1.1
- Affected versionversion=1.10
- Affected versionversion=1.11
- Affected versionversion=1.12
- Affected versionversion=1.13
- Affected versionversion=1.14
- Affected versionversion=1.15
- Affected versionversion=1.16
- Affected versionversion=1.17
- Affected versionversion=1.18
- Affected versionversion=1.19
- Affected versionversion=1.2
- Affected versionversion=1.20
- Affected versionversion=1.21
- Affected versionversion=1.22
- Affected versionversion=1.23
- Affected versionversion=1.24
- Affected versionversion=1.25
- Affected versionversion=1.26
- Affected versionversion=1.27
- Affected versionversion=1.28.0000
- Affected versionversion=1.3
- Affected versionversion=1.4
- Affected versionversion=1.5
- Affected versionversion=1.6
- Affected versionversion=1.7
- Affected versionversion=1.8
- Affected versionversion=1.9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- getupsvar Field overflow proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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