Administrator access via authentication subsystem bypass
Published Aug 27, 2025 · Updated May 15, 2026
Authentication bypass in Arcserve Unified Data Protection before 10.2 allows remote attackers to access administrator-level features. The authentication subsystem accepts manipulated request parameters or follows an alternate path without enforcing valid login credentials. Access requires adjacency to the service, and the affected endpoints and exact logic error remain undisclosed; successful bypass exposes protected functions or accounts.
Summary
What happened
Authentication bypass in Arcserve Unified Data Protection before 10.2 allows remote attackers to access administrator-level features. The authentication subsystem accepts manipulated request parameters or follows an alternate path without enforcing valid login credentials. Access requires adjacency to the service, and the affected endpoints and exact logic error remain undisclosed; successful bypass exposes protected functions or accounts.
The record
- CVE
- CVE-2025-34520
- Published
- Aug 27, 2025
- Updated
- May 15, 2026
- Vendor
- Arcserve
- Product
- Arcserve Unified Data Protection (UDP)
- Classifications
- CWE-288, CAPEC-115, T1190
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2025CVE publishedPublication date reported by the CVE source.
- May 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=7.*
- Affected versionversion=8.0 <=10.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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