What is CVE-2025-34521?

CVE-2025-34521 is a medium-severity vulnerability in Arcserve Udp, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-08-27.

How severe is CVE-2025-34521?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Arcserve Udp

CVE-2025-34521

A reflected cross-site scripting (XSS) vulnerability exists in the web interface of the Arcserve Unified Data Protection (UDP), where unsanitized user input is improperly reflected in HTTP responses. This flaw allows remote attackers with…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Arcserve Udp — versions 7.0
Arcserve Unified Data Protection (Udp) — versions 10.2, 8.0, 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-34521?: CVE-2025-34521 is a medium-severity vulnerability in Arcserve Udp, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-08-27.
How severe is CVE-2025-34521?: Medium severity. CVSS v3 base score is 5.4 out of 10.