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

published 2022-02-14 4 y ago modified 2026-07-09 4 mo ago also EUVD-2021-32191

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 17.5%; EPSS 17.5% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known, plus a Nuclei check

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.

Exploit prediction

17.55% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Emerson Dixell XWEB-500 - Arbitrary File Write nuclei detection template
swascan.com https://www.swascan.com/emerson referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-306 Missing Authentication for Critical Functionality
CWE-668 Exposure of Resource to Wrong Sphere

References

swascan.com /emerson
exploit, third-party-advisory

Sources

CVE List CVE-2021-45420
NVD CVE-2021-45420

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary