How severe is CVE-2021-31834?

CVE-2021-31834 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-31834 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31834?

CVE-2021-31834 primarily affects Mcafee Epolicy Orchestrator. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31834?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-31834 published?

CVE-2021-31834 was published on 2021-10-22 and last updated on 2026-06-17.

CVE-2021-31834

CVE-2021-31834 is a medium-severity vulnerability in Mcafee Epolicy Orchestrator with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mcafee Epolicy Orchestrator
Published: 2021-10-22
Last modified: 2026-06-17

Description

Stored Cross-Site Scripting vulnerability in McAfee ePolicy Orchestrator (ePO) prior to 5.10 Update 11 allows ePO administrators to inject arbitrary web script or HTML via multiple parameters where the administrator's entries were not correctly sanitized.

Frequently asked questions

What is CVE-2021-31834?: Stored Cross-Site Scripting vulnerability in McAfee ePolicy Orchestrator (ePO) prior to 5.10 Update 11 allows ePO administrators to inject arbitrary web script or HTML via multiple parameters where the administrator's entries were not correctly sanitized.
How severe is CVE-2021-31834?: CVE-2021-31834 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-31834 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31834?: CVE-2021-31834 primarily affects Mcafee Epolicy Orchestrator. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31834?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-31834 published?: CVE-2021-31834 was published on 2021-10-22 and last updated on 2026-06-17.

References

https://kc.mcafee.com/corporate/index?page=content&id=SB10366

Affected products (12)

cpe:2.3:a:mcafee:epolicy_orchestrator:*:*:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:-:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_1:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_10:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_2:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_3:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_4:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_5:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_6:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_7:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_8:*:*:*:*:*:*
cpe:2.3:a:mcafee:epolicy_orchestrator:5.10.0:update_9:*:*:*:*:*:*

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