What is CVE-2021-45427?

CVE-2021-45427 is a critical-severity vulnerability in Emerson Xweb300d Evo, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-12-30.

How severe is CVE-2021-45427?

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

Path Traversal in Emerson Xweb300d Evo

CVE-2021-45427

Emerson XWEB 300D EVO 3.0.7--3ee403 is affected by: unauthenticated arbitrary file deletion due to path traversal. An attacker can browse and delete files without any authentication due to incorrect access control and directory traversal.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2021-12-30 · 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: 0.192 (97.2th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.192 · newest: 0.192 · change: 0.000

Affected products

Emerson Xweb300d Evo
Emerson Xweb300d Evo Firmware — versions 3.0.7

Weakness classification (CWE)

CWE-22 — Path Traversal

References

drive.google.com/file/d/1RegGlCrtyQwW9DUirAbPDiIHKBWgsBea/view (Third Party Advisory)
drive.google.com/file/d/1IN7p9OKRgdszMVC1TKuZQDa4ySCPmQzO/view (Third Party Advisory)
drive.google.com/file/d/1iusYdheb62dom0DnvAzEiNR-e4EXSf2k/view (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45427?: CVE-2021-45427 is a critical-severity vulnerability in Emerson Xweb300d Evo, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-12-30.
How severe is CVE-2021-45427?: Critical severity. CVSS v3 base score is 9.8 out of 10.