What is CVE-2025-34523?

CVE-2025-34523 is a critical-severity vulnerability in Arcserve Udp, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-08-27.

How severe is CVE-2025-34523?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Arcserve Udp

CVE-2025-34523

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 process…

Vulnerability class: Buffer Overflow

EPSS: 0.005 (38.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Arcserve Udp — versions 7.0
Arcserve Unified Data Protection (Udp) — versions 10.2, 8.0, 0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

disclosure@vulncheck.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-34523?: CVE-2025-34523 is a critical-severity vulnerability in Arcserve Udp, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-08-27.
How severe is CVE-2025-34523?: Critical severity. CVSS v3 base score is 9.8 out of 10.