dbcve.org
UdpApplication · Arcserve

CVE-2025-34521

MEDIUM · 5.4 CVSS v3.1 Published 2025-08-27
Fix available
A fix is available. Upgrade to 7.0 / 10.2 or later.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A reflected cross-site scripting (XSS) vulnerability exists in the Arcserve UDP web interface where unsanitized user input is improperly reflected in HTTP responses. Attackers with low privileges can craft malicious links that execute arbitrary JavaScript in victim browsers, potentially leading to session hijacking or credential theft.

MitigationUpgrade to UDP version 10.2 or apply the available patch to versions 8.0-10.1 to implement proper input sanitization and output encoding.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
UdpApplication
Affected:< 7.0>= 8.0, < 10.2= 7.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Arcserve UDP version
    Open Windows Control Panel > Programs and Features, locate 'Arcserve Unified Data Protection' or 'Arcserve UDP' in the list, and note the Version column
    Affected if The version shown is less than 10.2 (including versions < 7.0, version 7.0, or versions 8.0-10.1)
  2. Check Arcserve UDP web interface accessibility
    Open a web browser and attempt to access the UDP web console by navigating to https://localhost:8015 or the configured hostname/port for your Arcserve UDP installation
    Affected if The web interface loads and is reachable on the network
  3. Verify web interface is enabled
    On the Arcserve UDP server, open Arcserve UDP Configuration or check Windows Services for 'Arcserve UDP Web Server' or similar service; confirm it is running
    Affected if The web server service is running and accepting connections
  4. Confirm version via product interface
    If the web console is accessible, log in and navigate to Help > About or Settings > System Information to view the exact product version
    Affected if The reported version is below 10.2

A user is affected if Arcserve UDP version is installed and the web interface is enabled, with the version being less than 10.2 (including versions < 7.0, 7.0 exactly, or 8.0-10.1)

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 7.0 / 10.2 or later
Fixed in 7.010.2
Interim mitigation

Upgrade to UDP version 10.2 or apply the available patch to versions 8.0-10.1 to implement proper input sanitization and output encoding.

Recommended fix High confidence

Arcserve UDP 10.2

  1. 1. Review the Arcserve UDP 10.2 release notes and upgrade documentation at support.arcserve.com for complete upgrade instructions
  2. 2. Create a complete backup of the current UDP configuration and database
  3. 3. Schedule a maintenance window as the upgrade will require system downtime
  4. 4. Download the UDP 10.2 installation package from the official Arcserve download portal
  5. 5. Stop all UDP services on the server before proceeding with the upgrade
  6. 6. Run the UDP 10.2 installer and follow the on-screen upgrade wizard
  7. 7. After installation completes, verify all services start successfully
  8. 8. Log in to the UDP web interface and confirm version 10.2 is displayed
Caveat Review 10.2 release notes for any configuration or feature changes from prior versions; no specific breaking changes mentioned in the advisory

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Udp Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing5.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,790
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-34521 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data