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CVE-2025-34521

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

MEDIUM
5.4
CVSS Score
Published: August 27, 2025 at 09:19 PM UTC
Updated: September 26, 2026 at 12:27 AM UTC
2 products affected across 1 vendorArcserve Unified Data ProtectionUDP

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Arcserve Unified Data Protection· Arcserve
95%
v ≤ 7.0v < 7.08.0 ≤ v ≤ 10.18.0 ≤ v < 10.27.07.0 update_17.0 update_2
Affected range stops below 10.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0, so it looks safe — our inference, not a vendor statement
UDP· Arcserve
95%
v ≤ 7.*v ≤ 7.08.0 ≤ v ≤ 10.18.0
Vendor states this is fixed in 10.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: [email protected]
https://support.arcserve.com/s/article/Important-Security-Bulletin-Must-read-for-all-Arcserve-UDP-customers-on-all-versions

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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