KEVIntel

Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2021-27931

LumisXP Before 10.0.0 allows unauthenticated blind XXE Denial of Service

Lumis / LumisXP

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Severity
CVSS 9.1 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
18.1%
First observed
29 Jun 2026
Last observed
30 Jul 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-27931 is an unauthenticated vulnerability affecting Lumis LumisXP. LumisXP (aka Lumis Experience Platform) before 10.0.0 allows unauthenticated blind XXE via an API request to PageControllerXml.jsp. One can...

Is it exploited?

Yes. KEVIntel sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Lumis / LumisXP.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

LumisXP Before 10.0.0 allows unauthenticated blind XXE Denial of Service

LumisXP (aka Lumis Experience Platform) before 10.0.0 allows unauthenticated blind XXE via an API request to PageControllerXml.jsp.

One can send a request crafted with an XXE payload and achieve outcomes such as reading local server files or denial of service.

Published
03 Mar 2021
Exploitation Reported
08 Nov 2025
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

nuclei_scanner

CVE References

Exploitation evidence

Why KEVIntel marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Shadowserver

Recorded 08 Nov 2025

Independent exploitation attestation added to the KEVIntel record.

Active exploitation observed

KEVIntel sensor

First observed 23 Jul 2026

First-party sensor telemetry confirms matching exploitation attempts.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

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Source Added
The Shadowserver First 2025-11-08 00:00 UTC
KEVIntel 2026-07-23 13:35 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

4

Attempts observed

3

Unique attacker IPs

3

Attacker countries

JP · NL · US

4

Sensors observed

Exploitation attempts over the last 40 days

Daily events observed by KEVIntel sensors

Updated 06 Aug 2026

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First observed 29 Jun 2026 · Last observed 30 Jul 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
1
User-Agents
4

Raw values available in Pro and Enterprise.

Virtual patch status

No KEVIntel virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-27931.yaml 25 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

18.1%

Weaknesses

Improper Restriction of XML External Entity Reference CWE-611

All CVSS Scores

CVSS v3.1 9.1 Critical

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

CVSS v2.0 6.4 Medium

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

Potential Proof of Concepts

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

LumisXP <10.0.0 - Blind XML External Entity Attack

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. Observed by KEVIntel sensors

    Evidence-backed exploitation signal

  2. Indicators of compromise added (8)

    Indicators of compromise recorded

  3. Public PoC available

    Public proof-of-concept code published

  4. Added to KEVIntel KEV Feed

    High-confidence, third-party attested exploitation

  5. Nuclei template available

    Scanner coverage available

  6. CVE published

    Vulnerability disclosed publicly

  7. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-27931

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2021-27931",
  "confidence": "Confirmed",
  "cvss_score": 9.1,
  "epss_score": 0.18132,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 4, "sensors": 4 }
}

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