Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-121382 Overview
A vulnerability was determined in Netcore NBR100V2 1.3.240614.030928. Affected by this issue is the function msg_aes_dec of the file /usr/bin/auto_ac. This manipulation causes integer overflow. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Critical Impact
Affected Products
- Netcore NBR100V2: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-03: CVE-2026-121382 published to the National Vulnerability Database by cna@vuldb.com
- 2026-11-03: last updated in the NVD database
Technical Details for CVE-2026-121382
Vulnerability Analysis
CVE-2026-121382 is a Integer Overflow weakness (CWE-189, CWE-190: Integer Overflow) in Netcore NBR100V2. Based on its CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. A number wraps around and leads to wrong size calculations.
With a CVSS base score of 7.7, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-189, CWE-190: Integer Overflow. A number wraps around and leads to wrong size calculations.
Attack Vector
Based on the CVSS vector, the flaw can be reached over the network, needs no login, and needs no user interaction. Attack complexity is low complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Detection Methods for CVE-2026-121382
Detection Strategies
- Inventory every instance of Netcore NBR100V2 and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward Netcore NBR100V2 application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-121382
Immediate Actions Required
- Apply the fixed version of Netcore NBR100V2 named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for Netcore NBR100V2.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-189 More CVEs with this weakness
- CWE-190: Integer Overflow More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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