CVE-2025-34523Network attack vector

Pre-authentication code execution via heap overwrite

Published Aug 27, 2025 · Updated Aug 4, 2026

Heap-based buffer overflow in Arcserve UDP before 10.2 allows remote attackers to execute code or crash the service via crafted network input. The network-facing input routines apply improper bounds checks to attacker-controlled data, allowing that data to corrupt heap memory. No authentication or user interaction is required; exploitation runs in the vulnerable process and can crash it or execute arbitrary code.

CVSS severity9.2
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Arcserve UDP before 10.2 allows remote attackers to execute code or crash the service via crafted network input. The network-facing input routines apply improper bounds checks to attacker-controlled data, allowing that data to corrupt heap memory. No authentication or user interaction is required; exploitation runs in the vulnerable process and can crash it or execute arbitrary code.

The record

CVE
CVE-2025-34523
Published
Aug 27, 2025
Updated
Aug 4, 2026
Vendor
Arcserve
Product
Arcserve Unified Data Protection (UDP)
Classifications
CWE-122, CAPEC-10, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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.

  1. Affected versionversion=0 <=7.*
  2. Affected versionversion=8.0 <=10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arcserve · Arcserve Unified Data Protection (UDP)version=0 <=7.*; version=8.0 <=10.1

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CAPEC-10Buffer Overflow via Environment Variables
T1190Exploit Public-Facing Application

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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