What is CVE-2025-70998?

CVE-2025-70998 is a critical-severity vulnerability in Utt 810, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2026-02-18.

How severe is CVE-2025-70998?

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

RCE in Utt 810

CVE-2025-70998

UTT HiPER 810 / nv810v4 router firmware v1.5.0-140603 was discovered to contain insecure default credentials for the telnet service, possibly allowing a remote attacker to gain root access via a crafted script.

Published 2026-02-18 · 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: 0.004 (35.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Utt 810 — versions 4.0
Utt 810 Firmware — versions 1.5.0-140603

Weakness classification (CWE)

CWE-1188 — Initialization of a Resource with an Insecure Default

References

github.com/cha0yang1/UTT-nv810v4-telnet-backdoor (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-70998?: CVE-2025-70998 is a critical-severity vulnerability in Utt 810, classified under Initialization of a Resource with an Insecure Default. CVSS score: 9.8/10. Published 2026-02-18.
How severe is CVE-2025-70998?: Critical severity. CVSS v3 base score is 9.8 out of 10.