8.8

CVE-2025-30276: qnap systems inc. qsync central Out-of-bounds Write

CVSS: 8.8v3.1HighAnalyzed
Published 11-02-2026Last modified 11-02-2026
Open JSON

Vulnerability summary

CVE-2025-30276 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in qnap systems inc. qsync central. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.57%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-02-2026
    PublishedVulnerability first disclosed.
  2. 11-02-2026
    Last modifiedVulnerability information updated.

Description

An out-of-bounds write vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.04 pp

From 0.52% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Qnap1 product
Qnap systems inc.1 product

2 vendors · 2 products

References

1 links