CVE-2025-62854VulnerabilityPublished 11 Feb 2026

CVE-2025-62854: QNAP Systems File Station 5 · CWE-400

Affects QNAP Systems File Station 5Source CVE Database V5

Not known to be exploited · CVSS 1.3 Low : upgrade to 5.5.6.5190 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 4.0 base score

1.3Low

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.5.6.5190

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

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: None
Vulnerable system integrity: None
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: Unreported

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: Unreported: Based on threat intelligence sources each of the following must apply: · No knowledge of publicly available proof-of-concept · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade QNAP Systems File Station 5 to 5.5.6.5190.

Affected software

Product	Affected	Fixed in
QNAP Systems Inc.File Station 5	Affected >=5.5.x <5.5.6.5190	Fixed in 5.5.6.5190

AI-suggested

To mitigate CVE-2025-62854, European organizations should: 1) Immediately upgrade QNAP File Station 5 to version 5.5.6.5190 or later, where the vulnerability is patched. 2) Enforce strong authentication policies, including multi-factor authentication (MFA), to reduce the risk of credential compromise. 3) Limit user privileges strictly to the minimum necessary to reduce the attack surface. 4) Segment NAS devices within secure network zones and restrict access to trusted IP addresses to prevent unauthorized access. 5) Monitor NAS device logs for unusual activity indicative of resource exhaustion attempts or brute force login attempts. 6) Implement network-level protections such as rate limiting and anomaly detection to identify and block potential DoS attempts. 7) Educate users on phishing and credential security to prevent account compromise. 8) Regularly audit and update NAS firmware and software to ensure all security patches are applied promptly. These measures collectively reduce the likelihood of exploitation and mitigate potential impact.

Description

CVE-2025-62854 is an uncontrolled resource consumption vulnerability in QNAP Systems Inc. 's File Station 5, affecting versions 5.5.x prior to 5.5.6.5190. A remote attacker with a valid user account can exploit this flaw to launch a denial-of-service (DoS) attack by exhausting system resources. The vulnerability requires no user interaction but does require authenticated access with at least user-level privileges. The CVSS 4.

Impact

For European organizations, the primary impact of CVE-2025-62854 is the potential denial of service on QNAP NAS devices running vulnerable File Station 5 versions. This can lead to temporary loss of access to critical files and shared resources, disrupting business operations, especially in sectors relying heavily on NAS for data storage and collaboration, such as finance, healthcare, and manufacturing. Although the vulnerability does not directly compromise data confidentiality or integrity, the availability impact can cause operational delays and increased recovery costs. Organizations with weak credential management or exposed NAS devices on public or poorly segmented networks face higher risk. The low CVSS score reflects limited severity, but the requirement for valid user credentials means insider threats or compromised accounts could be leveraged. The absence of known exploits reduces immediate risk, but unpatched systems remain vulnerable to opportunistic attacks. European entities with regulatory requirements for data availability and service continuity must consider this vulnerability in their risk assessments and patch management strategies.

CWE-400Uncontrolled Resource Consumption (opens in a new tab)
Class weaknessLikelihood of exploit: High
The product does not properly control the allocation and maintenance of a limited resource.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place.
Architecture and Design
Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or; uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Regular Expression Exponential Blowup (opens in a new tab)
Sustained Client Engagement (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

qnap.com/en/security-advisory/qsa-26-03 (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 18 Feb 2026, 15:13 UTC

WeaknessesCWE-400

Technical details

References

Community reviews

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