How severe is CVE-2021-29109?

CVE-2021-29109 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-29109 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29109?

CVE-2021-29109 affects Esri Portal For Arcgis. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29109?

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

When was CVE-2021-29109 published?

CVE-2021-29109 was published on 2021-10-01 and last updated on 2026-06-17.

CVE-2021-29109

CVE-2021-29109 is a medium-severity vulnerability in Esri Portal For Arcgis with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Esri Portal For Arcgis
Published: 2021-10-01
Last modified: 2026-06-17

Description

A reflected XSS vulnerability in Esri Portal for ArcGIS version 10.9 and below may allow a remote attacker able to convince a user to click on a crafted link which could potentially execute arbitrary JavaScript code in the user’s browser.

Frequently asked questions

What is CVE-2021-29109?: A reflected XSS vulnerability in Esri Portal for ArcGIS version 10.9 and below may allow a remote attacker able to convince a user to click on a crafted link which could potentially execute arbitrary JavaScript code in the user’s browser.
How severe is CVE-2021-29109?: CVE-2021-29109 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-29109 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29109?: CVE-2021-29109 affects Esri Portal For Arcgis. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29109?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29109 published?: CVE-2021-29109 was published on 2021-10-01 and last updated on 2026-06-17.

References

https://www.esri.com/arcgis-blog/products/arcgis-enterprise/administration/Portal-for-ArcGIS-Security-2021-Update-1-Patch/

Affected products (1)

cpe:2.3:a:esri:portal_for_arcgis:*:*:*:*:*:*:*:*

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