Is CVE-2025-34520 actively exploited?

No active exploitation of CVE-2025-34520 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-34520 be exploited remotely?

Yes. CVE-2025-34520 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-34520?

CVE-2025-34520 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2025-34520

CRITICAL

CVE-2025-34520

CWE-288Published: August 27, 2025· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An authentication bypass vulnerability in Arcserve Unified Data Protection (UDP) allows unauthenticated attackers to gain unauthorized access to protected functionality or user accounts. By manipulating specific request parameters or exploiting a logic flaw, an attacker can bypass login mechanisms without valid credentials and access administrator-level features. 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.

NVD Source

Technical Analysis

CVE-2025-34520 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.