What is CVE-2025-28039?

CVE-2025-28039 is a critical-severity vulnerability in Totolink Ex1200t, classified under OS Command Injection. CVSS score: 9.8/10. Published 2025-04-22.

How severe is CVE-2025-28039?

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

Is CVE-2025-28039 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Totolink Ex1200t

CVE-2025-28039

TOTOLINK EX1200T V4.1.2cu.5232_B20210713 was found to contain a pre-auth remote command execution vulnerability in the setUpgradeFW function through the FileName parameter.

Vulnerability class: Command Injection (OS Command Injection)

Published 2025-04-22 · 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: 0.012 (67.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.012 · change: +0.001

Affected products

Totolink Ex1200t
Totolink Ex1200t Firmware — versions 4.1.2cu.5232_b20210713

Weakness classification (CWE)

CWE-78 — OS Command Injection

Public proof-of-concept exploits

Lunax0/CVE_

References

locrian-lightning-dc7.notion.site/RCE2-1ad8e5e2b1a280fbb0cacc7e758e7299 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-28039?: CVE-2025-28039 is a critical-severity vulnerability in Totolink Ex1200t, classified under OS Command Injection. CVSS score: 9.8/10. Published 2025-04-22.
How severe is CVE-2025-28039?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-28039 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.