6.5

CVE-2025-62858: qnap systems inc. qts Stack-based Buffer Overflow

CVSS: 6.5v3.1MediumAnalyzed
Published 09-06-2026Last modified 09-06-2026
Open JSON

Vulnerability summary

CVE-2025-62858 is a medium (CVSS 6.5) Stack-based Buffer Overflow vulnerability in qnap systems inc. qts. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.6% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-06-2026
    PublishedVulnerability first disclosed.
  2. 09-06-2026
    Last modifiedVulnerability information updated.

Description

A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

0.00 pp

From 0.45% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.45%

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

Qnap2 products
  • qts5.2.0.2737:build_20240417 | 5.2.0.2744:build_20240424 | 5.2.0.2782:build_20240601 | 5.2.0.2802:build_20240620 | 5.2.0.2823:build_20240711 | 5.2.0.2851:build_20240808 | 5.2.0.2860:build_20240817 | 5.2.1.2930:build_20241025 | 5.2.2.2950:build_20241114 | 5.2.3.3006:build_20250108 | 5.2.4.3070:build_20250312 | 5.2.4.3079:build_20250321 | 5.2.4.3092:build_20250403 | 5.2.5.3145:build_20250526 | 5.2.6.3195:build_20250715 | 5.2.6.3229:build_20250818 | 5.2.7.3256:build_20250913 | 5.2.7.3297:build_20251024 | 5.2.8.3332:build_20251128 | 5.2.8.3350:build_20251216 | 5.2.8.3359:build_20251225
  • quts_heroh5.2.0.2737:build_20240417 | h5.2.0.2782:build_20240601 | h5.2.0.2789:build_20240607 | h5.2.0.2802:build_20240620 | h5.2.0.2823:build_20240711 | h5.2.0.2851:build_20240808 | h5.2.0.2860:build_20240817 | h5.2.1.2929:build_20241025 | h5.2.1.2940:build_20241105 | h5.2.2.2952:build_20241116 | h5.2.3.3006:build_20250108 | h5.2.4.3070:build_20250312 | h5.2.4.3079:build_20250321 | h5.2.5.3138:build_20250519 | h5.2.6.3195:build_20250715 | h5.2.7.3256:build_20250913 | h5.2.7.3297:build_20251024 | h5.2.8.3321:build_20251117 | h5.2.8.3350:build_20251216 | h5.2.8.3359:build_20251225 | h5.3.0.3115:build_20250430 | h5.3.0.3145:build_20250530 | h5.3.0.3192:build_20250716 | h5.3.1.3250:build_20250912 | h5.3.1.3292:build_20251024 | h5.3.2.3354:build_20251225 | h5.3.3.3424:build_20260305 | h6.0.0.3324:build_20251125 | h6.0.0.3382:build_20260122
Qnap systems inc.2 products
  • qts≥ 5.2.0, < 5.2.9.3410 build 20260214
  • quts hero≥ h5.2.0, < h5.2.9.3410 build 20260214 | ≥ h5.3.0, < h5.3.4.3500 build 20260520 | ≥ ?, < h6.0.0.3397 build 20260206

2 vendors · 4 products

References

1 links