High Memory corruption

CVE-2025-52872 — QTS, QuTS hero

A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.7.3256 build 20250913 and later QuTS hero h5.2.7.3256 build 20250913 and later QuTS hero h5.3.0.3192 build 20250716 and later

Published Jan 2, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: qnap

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.4% (30-day exploitation probability)+4
Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.36%

ahead of 28% of scored CVEs · Oct 14, 2026

Affects

Qnap

Qts and 3 more

CVSS base

8.1

High · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Qnap Qts, Qnap Quts Hero, QNAP Systems Inc. QTS…).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Qnap	Qts	version 5.2.0.2737-build_20240417version 5.2.6.3229-build_20250818version 5.2.6.3195-build_20250715version 5.2.5.3145-build_20250526version 5.2.4.3092-build_20250403version 5.2.4.3079-build_20250321version 5.2.4.3070-build_20250312version 5.2.3.3006-build_20250108 and 8 more version 5.2.2.2950-build_20241114version 5.2.0.2860-build_20240817version 5.2.0.2851-build_20240808version 5.2.0.2823-build_20240711version 5.2.0.2802-build_20240620version 5.2.0.2782-build_20240601version 5.2.0.2744-build_20240424version 5.2.1.2930-build_20241025	Vulnerable	NIST National Vulnerability Database
Qnap	Quts Hero	version h5.2.2.2952-build_20241116version h5.2.3.3006-build_20250108version h5.2.4.3070-build_20250312version h5.2.4.3079-build_20250321version h5.2.5.3138-build_20250519version h5.2.6.3195-build_20250715version h5.3.0.3115-build_20250430version h5.3.0.3145-build_20250530 and 10 more version h5.3.0.3192-build_20250716version h5.2.0.2782-build_20240601version h5.2.1.2940-build_20241105version h5.2.1.2929-build_20241025version h5.2.0.2860-build_20240817version h5.2.0.2851-build_20240808version h5.2.0.2823-build_20240711version h5.2.0.2802-build_20240620version h5.2.0.2789-build_20240607version h5.2.0.2737-build_20240417	Vulnerable	NIST National Vulnerability Database
QNAP Systems Inc.	QTS	≥ 5.2.x and < 5.2.7.3256 build 20250913	Vulnerable	CVE Program (cve.org) e CISA ADP
QNAP Systems Inc.	QuTS hero	≥ h5.2.x and < h5.2.7.3256 build 20250913≥ h5.3.x and < h5.3.0.3192 build 20250716	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
1.3	CVSS 4.0	Low	—	—	security@qnapsecurity.com.tw via NIST National Vulnerability Database
1.3	CVSS 4.0	Low	—	—	qnap via CVE Program (cve.org) e CISA ADP
8.1	CVSS 3.1	High	2.8	5.2	nvd@nist.gov via NIST National Vulnerability Database
8.1	CVSS 3.1	High	—	—	GitHub, Inc. via GitHub Security Advisories

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-120 · Classic Buffer Overflow

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.36%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Affected products added · qnap systems inc./qts, qnap systems inc./quts hero
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 8.1
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Jan 2, 2026 · qnap

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

3 on the record

www.qnap.com/en/security-advisory/qsa-25-50
Vendor Advisory, NIST National Vulnerability Database
github.com/advisories/GHSA-qhch-48gg-2f55
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2025-52872
GitHub Security Advisories

Elsewhere on this site

Qnap
every CVE for this vendor

Memory corruption
same class

CWE-120
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-24719 QTS, QuTS hero Jun 10, 2026
Medium CVE-2026-24717 QTS, QuTS hero Jun 10, 2026
High CVE-2026-24716 QTS, QuTS hero Jun 10, 2026
High CVE-2026-22893 QTS, QuTS hero Jun 10, 2026
High CVE-2025-66281 QTS, QuTS hero Jun 10, 2026
High CVE-2025-66273 QTS, QuTS hero Jun 10, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-52872 is "QTS, QuTS hero", rated High. It affects Qts (Qnap); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.1 describes technical severity. EPSS 0.36% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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