How severe is CVE-2021-27931?

CVE-2021-27931 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2021-27931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27931?

CVE-2021-27931 affects Lumis Lumis Experience Platform. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27931?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-27931 published?

CVE-2021-27931 was published on 2021-03-03 and last updated on 2026-06-17.

CVE-2021-27931

CVE-2021-27931 is a critical-severity vulnerability in Lumis Lumis Experience Platform with a CVSS 3.x base score of 9.1. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-611.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Lumis Lumis Experience Platform
Published: 2021-03-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-27931?: 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.
How severe is CVE-2021-27931?: CVE-2021-27931 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2021-27931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27931?: CVE-2021-27931 affects Lumis Lumis Experience Platform. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27931?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27931 published?: CVE-2021-27931 was published on 2021-03-03 and last updated on 2026-06-17.

References

https://github.com/sl4cky/LumisXP-XXE---POC/blob/main/poc.txt

Affected products (1)

cpe:2.3:a:lumis:lumis_experience_platform:*:*:*:*:*:*:*:*

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