Remote code execution via unsized CGI formatting
Published Sep 15, 2026 · Updated Sep 15, 2026
Stack-based buffer overflow in Netcore NR255-V 1.5.130703 allows remote attackers to execute arbitrary code through a crafted CGI request. The ntools_tcpdump_start_set.cgi handler uses an unsized sprintf operation to copy attacker-controlled form values into a fixed stack buffer. The published record does not state whether the management endpoint requires authentication; successful overflow can corrupt control data and execute code.
Summary
What happened
Stack-based buffer overflow in Netcore NR255-V 1.5.130703 allows remote attackers to execute arbitrary code through a crafted CGI request. The ntools_tcpdump_start_set.cgi handler uses an unsized sprintf operation to copy attacker-controlled form values into a fixed stack buffer. The published record does not state whether the management endpoint requires authentication; successful overflow can corrupt control data and execute code.
The record
- CVE
- CVE-2026-76861
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- Netcore
- Product
- NR255-V
- Classifications
- T1190
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 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=1.5.130703
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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