Arcserve Unified Data Protection up to 7.x/10.1 authentication bypass

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Arcserve Unified Data Protection up to 7.x/10.1. This vulnerability affects unknown code. The manipulation leads to authentication bypass. This vulnerability is referenced as CVE-2025-34520. The attack needs to be initiated within the local network. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Arcserve Unified Data Protection up to 7.x/10.1 and classified as critical. This issue affects an unknown functionality. The manipulation with an unknown input leads to a authentication bypass vulnerability. Using CWE to declare the problem leads to CWE-288. A product requires authentication, but the product has an alternate path or channel that does not require authentication. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published by watchTowr. The advisory is shared at support.arcserve.com. The identification of this vulnerability is CVE-2025-34520 since 04/15/2025. The exploitation is known to be difficult. The attack can only be done within the local network. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

Upgrading to version 10.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-26077). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.5

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication bypass
CWE: CWE-288 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Unified Data Protection 10.2

Timelineinfo

04/15/2025 CVE reserved
08/28/2025 +135 days Advisory disclosed
08/28/2025 +0 days VulDB entry created
09/09/2025 +12 days VulDB entry last update

Sourcesinfo

Advisory: support.arcserve.com
Researcher: watchTowr
Status: Confirmed

CVE: CVE-2025-34520 (🔒)
GCVE (CVE): GCVE-0-2025-34520
GCVE (VulDB): GCVE-100-321665
EUVD: 🔒

Entryinfo

Created: 08/28/2025 07:40
Updated: 09/09/2025 17:31
Changes: 08/28/2025 07:40 (67), 08/28/2025 19:34 (1), 09/09/2025 17:31 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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