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9.8
CVSS
Critical

CVE-2021-45420

PUBLISHED

Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnerability in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and...

Not yet in CISA KEV

Exploited in the wild PoC available Remote Low complexity No user interaction
Vendor
Emerson
Product
Dixell XWEB-500
Published
Feb 14, 2022
EPSS
—

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Description

Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnerability in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and /cgi-bin/lo_utils.cgi. An attacker will be able to write any file on the target system without any kind of authentication mechanism, and this can lead to denial of service and potentially remote code execution. Note: the product has not been supported since 2018 and should be removed or replaced

nuclei_scanner

CVSS Scores

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 10.0 High

AV:N/AC:L/Au:N/C:C/I:C/A:C

Exploitation Status

Exploited in the wild

Recorded 2025-07-14 00:00:00 UTC · The Shadowserver (via CIRCL)

Proof of concept available

Recorded 2026-06-12 14:20:57 UTC · Nuclei Templates

References

Known Exploited Vulnerability Sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
The Shadowserver (via CIRCL) First 2025-07-14 00:00 UTC

Scanner Integrations

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-45420.yaml Jun 01, 2026

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

CVE-2021-45420

nuclei · Created Unknown

Timeline

  • Proof of Concept Exploit Available

  • Detected by Nuclei

  • Added to KEVIntel

  • CVE Published to Public

  • CVE ID Reserved