CVE-2025-34521
CVE-2025-34521 is a medium-severity vulnerability in Arcserve Udp with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 5.4)
- CVSS v4: 4.8
- EPSS exploit prediction: 0% (10th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-27846
- Weakness: CWE-79
- Affected product: Arcserve Udp
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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 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.
- How severe is CVE-2025-34521?
- CVE-2025-34521 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2025-34521 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-34521?
- CVE-2025-34521 primarily affects Arcserve Udp. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2025-34521?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-34521 have an EU (EUVD) identifier?
- Yes. CVE-2025-34521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27846.
- When was CVE-2025-34521 published?
- CVE-2025-34521 was published on 2025-08-27 and last updated on 2026-06-17.
References
Affected products (4)
- cpe:2.3:a:arcserve:udp:*:*:*:*:*:*:*:*
- cpe:2.3:a:arcserve:udp:7.0:-:*:*:*:*:*:*
- cpe:2.3:a:arcserve:udp:7.0:update_1:*:*:*:*:*:*
- cpe:2.3:a:arcserve:udp:7.0:update_2:*:*:*:*:*:*
More vulnerabilities in Arcserve Udp
- CVE-2025-34523 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the network-facing input handling routines of Arcserve Unified…
- CVE-2025-34522 — Critical (CVSS 9.8): A heap-based buffer overflow vulnerability exists in the input parsing logic of Arcserve Unified Data Protection (UDP).…
- CVE-2025-34520 — Critical (CVSS 9.8): An authentication bypass vulnerability in Arcserve Unified Data Protection (UDP) allows unauthenticated attackers to…
- CVE-2024-0799 — Critical (CVSS 9.8): An authentication bypass vulnerability exists in Arcserve Unified Data Protection 9.2 and 8.1 in the…
- CVE-2023-42000 — Critical (CVSS 9.8): Arcserve UDP prior to 9.2 contains a path traversal vulnerability in…
- CVE-2023-41999 — Critical (CVSS 9.8): An authentication bypass exists in Arcserve UDP prior to version 9.2. An unauthenticated, remote attacker can obtain a…
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