CVE-2021-45420
Medium PUBLISHEDEmerson 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
Recommended Action
Treat as actively exploited. Assess exposure, apply compensating controls where patching is delayed, and monitor for abuse.
At a Glance
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
- Published
- Feb 14, 2022
- First Seen
- Jul 14, 2025
- CVSS
- 9.8 Critical
- EPSS
- —
Recommended Actions
- Treat as actively exploited. Assess exposure, apply compensating controls where patching is delayed, and monitor for abuse.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
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 |
Detection Context
Request patterns and scanner artifacts observed for this CVE. Operational detection logic guidance is coming soon.
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-45420.yaml | Jun 01, 2026 |
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
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.
nuclei · Created Unknown
Timeline
-
Proof of Concept Exploit Available
-
Detected by Nuclei
-
Added to KEVIntel
-
CVE Published to Public
-
CVE ID Reserved
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v1/pro/kevs/CVE-2021-45420
{
"cve_id": "CVE-2021-45420",
"title": "Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnera...",
"affected_vendor": "Emerson",
"affected_product": "Dixell XWEB-500",
"confidence": "Medium",
"cvss_score": 9.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}