---
id: CVE-2025-34523
title: >-
  A heap-based buffer overflow vulnerability exists in the network-facing input
  handling routines of Arcserve Unified Data Protection (UDP)
summary: >-
  A heap-based buffer overflow vulnerability exists in the network-facing input
  handling routines of Arcserve Unified Data Protection (UDP). This flaw is
  reachable without authentication and results from improper bounds checking
  when proce…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: arcserve
product: udp
affected:
  - udp < 7.0
  - 'udp >= 8.0, < 10.2'
  - udp = 7.0
patched:
  - udp 10.2
published: '2025-08-27'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-34523'
references:
  - url: >-
      https://support.arcserve.com/s/article/Important-Security-Bulletin-Must-read-for-all-Arcserve-UDP-customers-on-all-versions
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.0053
epssPercentile: 0.42413
ingestedAt: '2026-09-26T00:22:39.870Z'
---

## Overview

A heap-based buffer overflow vulnerability exists in the network-facing input handling routines of Arcserve Unified Data Protection (UDP). This flaw is reachable without authentication and results from improper bounds checking when processing attacker-controlled input. By sending specially crafted data, a remote attacker can corrupt heap memory, potentially causing a denial of service or enabling arbitrary code execution depending on the memory layout and exploitation techniques used. This vulnerability is similar in nature to CVE-2025-34522 but affects a separate code path or component. No user interaction is required, and exploitation occurs in the context of the vulnerable process. 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.

## Affected

- `udp < 7.0`
- `udp >= 8.0, < 10.2`
- `udp = 7.0`

## Remediation

Upgrade past the affected range:

- `udp 10.2`