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CVE Record

CVE-2021-45420: Emerson Dixell XWEB-500 products are affected by arbitrary file write vulnerability in /cgi-bin/logo_extra_...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-45420 affects Emerson Dixell XWEB-500 systems and allows unauthenticated arbitrary file writes. Sources say this can cause denial of service and potentially remote code execution. The product has been unsupported since 2018, so organizations should treat any remaining deployment as a legacy risk requiring removal or replacement.

Executive priority

Prioritize remediation where XWEB-500 devices remain operational. The main business concern is unsupported infrastructure with unauthenticated write capability that could disrupt operations or possibly support deeper compromise.

Technical view

The reported flaw is unauthenticated arbitrary file write in /cgi-bin/logo_extra_upload.cgi, /cgi-bin/cal_save.cgi, and /cgi-bin/lo_utils.cgi on Emerson Dixell XWEB-500 products. The CVE record does not provide CVSS, CWE, affected version ranges, or a patch. Impact is described as denial of service and potential remote code execution.

Likely exposure

Exposure is likely limited to organizations still running Emerson Dixell XWEB-500 devices, especially if management interfaces are reachable from untrusted networks. The source bundle does not identify specific versions, CPEs, or deployment prevalence.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. Risk still matters because the described condition is unauthenticated file write on an unsupported product, which can enable serious operational impact if reachable.

Researcher notes

Evidence is sparse: no CVSS vector, CWE mapping, affected version range, CPE, patch, or exploit evidence is provided. Analysis should stay scoped to XWEB-500 and the three named CGI paths. Avoid assuming broader Emerson Dixell product impact.

Mitigation direction

  • Identify and remove or replace unsupported XWEB-500 products.
  • Check Emerson or trusted advisory guidance for any available product-specific direction.
  • Restrict access to XWEB-500 management interfaces to trusted administrative networks.
  • Isolate legacy refrigeration or control networks from business and internet-facing networks.
  • Monitor affected systems for unexpected file changes or service disruption.

Validation and detection

  • Inventory environments for Emerson Dixell XWEB-500 products.
  • Confirm whether any XWEB-500 interface is reachable from untrusted networks.
  • Review device lifecycle records to verify unsupported status since 2018.
  • Check logs and filesystem integrity indicators for unexpected modifications.
  • Document compensating controls where replacement is not immediate.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-45420 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
2Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.