What is CVE-2026-7834?

CVE-2026-7834 is a critical-severity vulnerability in Efm Iptime Nas1dual, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-05-05.

How severe is CVE-2026-7834?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Efm Iptime Nas1dual

CVE-2026-7834

A security vulnerability has been detected in EFM ipTIME NAS1dual 1.5.24. This issue affects the function get_csrf_whites of the file /cgi/advanced/misc_main.cgi. Such manipulation leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Vulnerability class: Buffer Overflow

Published 2026-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.004

Affected products

Efm Iptime Nas1dual — versions 1.5.24

Weakness classification (CWE)

References

github.com/glkfc/IoT-Vulnerability/blob/main/iptime/nas1dual/iptime2_en.md (exploit)
vuldb.com/submit/807787 (third-party-advisory)
vuldb.com/vuln/361113 (technical-description, vdb-entry)
vuldb.com/vuln/361113/cti (signature, permissions-required)

Frequently asked questions

What is CVE-2026-7834?: CVE-2026-7834 is a critical-severity vulnerability in Efm Iptime Nas1dual, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-05-05.
How severe is CVE-2026-7834?: Critical severity. CVSS v3 base score is 9.8 out of 10.