Is CVE-2021-45420 actively exploited?

Yes. CVE-2021-45420 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-45420 be exploited remotely?

The attack vector of CVE-2021-45420 has not been classified yet.

What is the CVSS score of CVE-2021-45420?

CVE-2021-45420 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-45420

UNKNOWNCISA KEVIN THE WILD

CVE-2021-45420

Published: April 11, 2026

EPSS:82.25%probability of exploitation in 30 daysPercentile:99.2th

Official 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

NVD Source

Technical Analysis

CVE-2021-45420 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-45420 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.