CVE-2025-34521

Arcserve UDP < 10.2 Reflected Cross-Site Scripting (XSS)

Description

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 low privileges to craft malicious links that, when visited by another user, execute arbitrary JavaScript in the victim’s browser. Successful exploitation may lead to session hijacking, credential theft, or other client-side impacts. The vulnerability requires user interaction and occurs within a shared browser context. This vulnerability affects all UDP versions prior to 10.2. UDP 10.2 includes the necessary patches and requires no action. Versions 8.0 through 10.1 are supported and require either patch application or upgrade to 10.2. Versions 7.x and earlier are unsupported or out of maintenance and must be upgraded to 10.2 to remediate the issue.

Category

4.8
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.20%
Vendor Advisory arcserve.com
Affected: Arcserve Unified Data Protection (UDP)
Published at:
Updated at:

References

Link Tags
https://support.arcserve.com/s/article/Important-Security-Bulletin-Must-read-for-all-Arcserve-UDP-customers-on-all-versions patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-34521?
CVE-2025-34521 has been scored as a medium severity vulnerability.
How to fix CVE-2025-34521?
To fix CVE-2025-34521, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-34521 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-34521 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-34521?
CVE-2025-34521 affects Arcserve Unified Data Protection (UDP).
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