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CVE-2026-22899· NVD / CVE Program· CNA qnap

A NULL pointer dereference vulnerability has been reported to affect File Station 6.

A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later

LowCVSS 1.3 · v4.0—No exploit No fix recorded
Published
Jun 10, 2026
Updated
Jul 23, 2026
EPSS
0.4% · 30th percentile
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Report tools

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Action score

5

Monitor

Low priority for now.

CVSS
5 / 40 · 1.3 / 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
1.3
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:N/VA:L/SC:N/SI:N/SA:N/E:U

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

Affected systems

VendorProduct
qnapfile station

Affected versions

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

  • qnap file station5.5.6.4691 and later · before 5.5.6.5208

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. File Station 5

    • 5.5.0 and later · before 5.5.6.5208affected

Same product

qnap: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-33031An improper certificate validation vulnerability has been reported to affect File Station 5.
    33Monitor
  • CVE-2025-30279An improper certificate validation vulnerability has been reported to affect File Station 5.
    33Monitor
  • CVE-2025-29885An improper certificate validation vulnerability has been reported to affect File Station 5.
    33Monitor
  • CVE-2025-29884An improper certificate validation vulnerability has been reported to affect File Station 5.
    33Monitor
  • CVE-2025-29883An improper certificate validation vulnerability has been reported to affect File Station 5.
    33Monitor
  • CVE-2025-29900An allocation of resources without limits or throttling vulnerability has been reported to affect File Station 5.
    28Monitor

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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

Variant candidates

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

  • CVE-2025-29875285 days apartA NULL pointer dereference vulnerability has been reported to affect File Station 5.
    28Monitor
  • CVE-2025-29901288 days apartA NULL pointer dereference vulnerability has been reported to affect File Station 5.
    28Monitor
  • CVE-2025-47207215 days apartA NULL pointer dereference vulnerability has been reported to affect several product versions.
    21Monitor
  • CVE-2025-29879285 days apartA NULL pointer dereference vulnerability has been reported to affect File Station 5.
    21Monitor
  • CVE-2025-29886285 days apartA NULL pointer dereference vulnerability has been reported to affect File Station 5.
    21Monitor
  • CVE-2025-29888285 days apartA NULL pointer dereference vulnerability has been reported to affect File Station 5.
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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-476 · NULL Pointer Dereference

CVSS vector

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

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

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

References

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

All records