CVE-2026-7834: Critical Stack-Based Buffer Overflow in EFM ipTIME NAS1dual
The National Vulnerability Database has disclosed CVE-2026-7834, a critical stack-based buffer overflow vulnerability affecting EFM ipTIME NAS1dual firmware version 1.5.24. This flaw resides in the get_csrf_whites function within the /cgi/advanced/misc_main.cgi file, allowing remote attackers to trigger the overflow.
This is a severe issue, rated 9.8 CVSS (Critical), indicating unauthenticated, remote exploitation leading to complete compromise of confidentiality, integrity, and availability. The exploit has been publicly disclosed, raising the urgency for remediation. The National Vulnerability Database notes that the vendor, EFM, has not responded to the disclosure.
For defenders, the public availability of an exploit coupled with the critical severity means these NAS devices are prime targets. Attackers will leverage this to gain initial access or pivot within networks. Given the nature of NAS devices, compromise could lead to significant data loss or provide a persistent foothold for further lateral movement.
What This Means For You
- If your organization uses EFM ipTIME NAS1dual devices, particularly firmware version 1.5.24, you are immediately exposed to remote, unauthenticated compromise. Prioritize isolating these devices from public networks and internal critical segments. Monitor for any vendor updates or official mitigation guidance, as patches are currently unavailable.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-7834: EFM ipTIME NAS1dual get_csrf_whites Stack Overflow
title: CVE-2026-7834: EFM ipTIME NAS1dual get_csrf_whites Stack Overflow
id: scw-2026-05-05-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-7834 by targeting the get_csrf_whites function within misc_main.cgi on EFM ipTIME NAS1dual devices. This rule looks for POST requests to the specific CGI script and URI query parameter associated with the vulnerable function, indicating a potential stack-based buffer overflow attack.
author: SCW Feed Engine (AI-generated)
date: 2026-05-05
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7834/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/cgi/advanced/misc_main.cgi'
cs-method|contains:
- 'POST'
cs-uri-query|contains:
- 'get_csrf_whites'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7834 | Buffer Overflow | EFM ipTIME NAS1dual version 1.5.24 |
| CVE-2026-7834 | Buffer Overflow | Vulnerable function: get_csrf_whites in /cgi/advanced/misc_main.cgi |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 05, 2026 at 17:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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