Cyber Resilience

CVE-2021-27931

CriticalPublic PoC

Published: 03 March 2021

Published
03 March 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.8942 99.6th percentile
Risk Priority 72 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-27931 is a critical-severity Improper Restriction of XML External Entity Reference (CWE-611) vulnerability in Lumis Lumis Experience Platform. Its CVSS base score is 9.1 (Critical).

Operationally, ranked in the top 0.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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.

CWE(s)
CWE-611

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

lumis
lumis experience platform
≤ 10.0.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-611

Penetration testing includes XML external entity payloads, detecting XXE vulnerabilities and enabling their mitigation.

SI-4 System Monitoring
addresses: CWE-611

Identifies XML external entity processing via monitoring of unusual file/network access or resource usage.

References