Cyber Resilience

CVE-2021-3539

Medium

Published: 04 August 2021

Published
04 August 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
EPSS Score 0.0020 41.6th percentile
Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-3539 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Espocrm Espocrm. Its CVSS base score is 6.3 (Medium).

Operationally, ranked at the 41.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

EspoCRM 6.1.6 and prior suffers from a persistent (type II) cross-site scripting (XSS) vulnerability in processing user-supplied avatar images. This issue was fixed in version 6.1.7 of the product.

CWE(s)
CWE-79

Related Threats

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

Affected Assets

espocrm
espocrm
≤ 6.1.6

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-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-10 Information Input Validation
addresses: CWE-79

Validates web inputs to reject script-related content that could produce XSS.

SI-15 Information Output Filtering
addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

References