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CVE-2025-34520— Arcserve UDP < 10.2 Authentication Bypass

Quick assessment

Affected
Arcserve Unified Data Protection (UDP)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arcserve Unified Data Protection是Arcserve公司的一体化数据和勒索软件保护解决方案。 Arcserve Unified Data Protection 10.2之前版本存在安全漏洞，该漏洞源于身份验证绕过，可能导致未经授权访问。

AI Predicted 9.8 Difficulty: Easy EPSS 0.37% · P28

Affected Version Matrix 3

VendorProduct Version RangeStatus
Arcserve Unified Data Protection (UDP) 10.2 unaffected
8.0≤ 10.1 affected
≤ 7.* affected
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I. Basic Information for CVE-2025-34520

Vulnerability Information
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Vulnerability Title
Arcserve UDP < 10.2 Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Arcserve Unified Data Protection 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arcserve Unified Data Protection是Arcserve公司的一体化数据和勒索软件保护解决方案。 Arcserve Unified Data Protection 10.2之前版本存在安全漏洞，该漏洞源于身份验证绕过，可能导致未经授权访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Arcserve Unified Data Protection (UDP) 8.0 ~ 10.1 -

II. Public POCs for CVE-2025-34520

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III. Intelligence Information for CVE-2025-34520

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Vendor Advisories for CVE-2025-34520 (1)

Same Patch Batch · Arcserve · 2025-08-27 · 4 CVEs total

CVE-2025-34523 9.2 CRITICAL Arcserve UDP < 10.2 Pre-Authentication Heap Overflow
CVE-2025-34521 Arcserve UDP < 10.2 Reflected Cross-Site Scripting (XSS)
CVE-2025-34522 Arcserve UDP < 10.2 Pre-Authentication Heap Overflow

IV. Related Vulnerabilities

Same product: Unified Data Protection (UDP)
Same vendor: Arcserve
Same weakness: CWE-288

V. Comments for CVE-2025-34520

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