CVE-2026-76861: Stack-based Buffer Overflow in Netcore NR255-V
Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow vulnerability in the ntools_tcpdump_start_set.cgi endpoint. This flaw is caused by an unsized sprintf call when processing form values, allowing an attacker to submit crafted input to overflow the stack buffer. The vulnerability has a high severity with a CVSS 4.0 score of 8.7. There is no information about an available patch or vendor advisory at this time.
AI Analysis
Technical Summary
CVE-2026-76861 is a stack-based buffer overflow vulnerability in Netcore NR255-V version 1.5.130703. The issue occurs in the ntools_tcpdump_start_set.cgi component due to an unsized sprintf call when handling form input, which can lead to stack buffer overflow. An attacker with low privileges and no user interaction required can exploit this vulnerability remotely over the network to potentially execute arbitrary code with high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability may allow remote attackers to execute arbitrary code on the affected device, potentially leading to full compromise of the system. The vulnerability affects confidentiality, integrity, and availability with high impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict access to the vulnerable CGI endpoint and monitor for suspicious activity related to this component.
CVE-2026-76861: Stack-based Buffer Overflow in Netcore NR255-V
Description
Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow vulnerability in the ntools_tcpdump_start_set.cgi endpoint. This flaw is caused by an unsized sprintf call when processing form values, allowing an attacker to submit crafted input to overflow the stack buffer. The vulnerability has a high severity with a CVSS 4.0 score of 8.7. There is no information about an available patch or vendor advisory at this time.
CVSS v4.0
Score 8.7high
Affected software
Netcore
NR255-V
pkg:github/draw-ctf/netcore-router-public-refsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-76861 is a stack-based buffer overflow vulnerability in Netcore NR255-V version 1.5.130703. The issue occurs in the ntools_tcpdump_start_set.cgi component due to an unsized sprintf call when handling form input, which can lead to stack buffer overflow. An attacker with low privileges and no user interaction required can exploit this vulnerability remotely over the network to potentially execute arbitrary code with high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability may allow remote attackers to execute arbitrary code on the affected device, potentially leading to full compromise of the system. The vulnerability affects confidentiality, integrity, and availability with high impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict access to the vulnerable CGI endpoint and monitor for suspicious activity related to this component.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-19T21:47:08.935Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa9c06c55bf5e2cf56f8242
Added to database: 09/15/2026, 22:02:20 UTC
Last enriched: 09/15/2026, 22:24:55 UTC
Last updated: 09/16/2026, 03:06:23 UTC
Views: 3
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