CVE-2025-62858

MEDIUM
Published Jun 9, 2026 Modified Jun 12, 2026 CWE-121

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

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CVSS v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

EPSS — Exploit Prediction

0.0045
Probability of exploitation
0.36%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-121 CWE-121

Affected Products

Vendor Product
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap qts
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero
qnap quts_hero

References

Frequently Asked Questions

What is CVE-2025-62858? +
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 It has a CVSS v3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2025-62858? +
CVE-2025-62858 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0045, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2025-62858? +
CVE-2025-62858 affects products from qnap, specifically: qts, quts_hero. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-62858? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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