NVD / CVE Program· CNA qnap

CVE-2024-56805: A buffer overflow vulnerability has been reported to affect several QNAP operating system versions.

MediumCVSS 5.3 · v4.0—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 21/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.45% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers who have gained user access to modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.4.3079 build 20250321 and later QuTS hero h5.2.4.3079 build 20250321 and later

Memory safety

Published: Jun 6, 2025
Updated: Jun 17, 2026
EPSS: 0.4% · 39th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 21 / 40 · 5.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · qnap: 5.3; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
qnap	qts	cpe:2.3:o:qnap:qts
qnap	quts hero	cpe:2.3:o:qnap:quts_hero

Versions reported by the vendor

Affected version ranges reported by the assigning authority (qnap). Independent of NVD's CPE analysis and usually ahead of it.

QNAP Systems Inc. QTS
- 5.2.x and later · before 5.2.4.3079 build 20250321affected
QNAP Systems Inc. QuTS hero
- h5.2.x and later · before h5.2.4.3079 build 20250321affected

Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

qnap qts5.2.0.2737
qnap qts5.2.0.2744
qnap qts5.2.0.2782
qnap qts5.2.0.2802
qnap qts5.2.0.2823
qnap qts5.2.0.2851
qnap qts5.2.0.2860
qnap qts5.2.1.2930
qnap qts5.2.2.2950
qnap qts5.2.3.3006
qnap qts5.2.4.3070
qnap quts heroh5.2.0.2737
qnap quts heroh5.2.0.2782
qnap quts heroh5.2.0.2789
qnap quts heroh5.2.0.2802
qnap quts heroh5.2.0.2823
qnap quts heroh5.2.0.2851
qnap quts heroh5.2.0.2860
qnap quts heroh5.2.1.2929
qnap quts heroh5.2.1.2940

Same product

qnap: all records

Other highest-scoring records for the same primary product.

CVE-2020-2509Command Injection Vulnerability in QTS and QuTS heroKEV
79This week
CVE-2018-19949If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands.KEV
78This week
CVE-2019-7193This improper input validation vulnerability allows remote attackers to inject arbitrary code to the system.KEV
73This week

Published before and after this one in the same product

← EarlierCVE-2024-53698Mar 7, 2025 · A double free vulnerability has been reported to affect several QNAP operating system versions.
8Monitor
← EarlierCVE-2024-53699Mar 7, 2025 · An out-of-bounds write vulnerability has been reported to affect several QNAP operating system versions.
8Monitor
Later →CVE-2025-22481Jun 6, 2025 · A command injection vulnerability has been reported to affect several QNAP operating system versions.
34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Searat and izutfinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2024-27130381 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
46Plan
CVE-2023-51367273 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
35Monitor
CVE-2024-27128381 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
35Monitor
CVE-2024-27129381 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
35Monitor
CVE-2023-50362406 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
35Monitor
CVE-2023-50364406 days apartA buffer copy without checking size of input vulnerability has been reported to affect several QNAP operating system versions.
35Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: X

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (0)

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

www.qnap.com/en/security-advisory/qsa-25-12

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records