High

NULL Pointer Dereference DoS in QNAP QTS and QuTS hero

IdentifiersCVE-2025-62848CWE-476· NULL Pointer Dereference

CVE-2025-62848 is a NULL pointer dereference vulnerability affecting several QNAP operating system versions, specifically QTS and QuTS hero. According to the provided content, a remote attacker can trigger the flaw and cause the affected system to dereference a NULL pointer, resulting in a denial-of-service condition. The available material does not identify the specific vulnerable component, function, or code path. The issue was one of the vulnerabilities demonstrated at Pwn2Own Ireland 2025 and was patched by QNAP in QTS 5.2.7.3297 build 20251024 and later, QuTS hero h5.2.7.3297 build 20251024 and later, and QuTS hero h5.3.1.3292 build 20251024 and later.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a remote attacker to crash the vulnerable service or system, causing denial of service. Based on the provided information, the impact is limited to service disruption and loss of availability; there is no specific evidence in the supplied content that this issue by itself enables code execution, privilege escalation, or information disclosure.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce remote exposure of QTS and QuTS hero management and service interfaces to untrusted networks, restrict access with network segmentation and ACLs, and limit reachable attack surface to trusted administrators and hosts only. Monitor for repeated crashes or abnormal service restarts that could indicate attempted exploitation. However, no vendor-specified workaround beyond updating is provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade affected systems to a fixed release provided by QNAP. The content states that the vulnerability is fixed in QTS 5.2.7.3297 build 20251024 and later, QuTS hero h5.2.7.3297 build 20251024 and later, and QuTS hero h5.3.1.3292 build 20251024 and later. Apply the latest available vendor updates across QTS and QuTS hero to ensure the patch is present.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

QNAP SystemsQtsoperating_system

QNAP SystemsQuts Herooperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

8 SOURCESView more in app

security affairsNews

Mar 23, 2026

QNAP fixed four vulnerabilities demonstrated at Pwn2Own Ireland 2025

A QNAP vulnerability affecting QTS and QuTS hero operating systems, referenced as one of the zero-day vulnerabilities patched after Pwn2Own Ireland 2025.

securityaffairsNews

Nov 10, 2025

QNAP fixed multiple zero-days in its software demonstrated at Pwn2Own 2025

A zero-day vulnerability in QNAP’s QTS and QuTS hero operating systems, demonstrated at Pwn2Own 2025 and patched by QNAP.

bleeping computerNews

Nov 7, 2025

QNAP fixes seven NAS zero-day flaws exploited at Pwn2Own

A zero-day vulnerability in QNAP's QTS and QuTS hero operating systems, exploited during Pwn2Own Ireland 2025.

security weekNews

Mar 18, 2026

QNAP Patches Vulnerabilities Exploited at Pwn2Own Ireland

One of a set of vulnerabilities demonstrated at Pwn2Own Ireland 2025 as part of an exploit chain combining injection vulnerabilities and a format string bug; patched in QNAP QTS/QuTS hero releases.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2025-62848

NVD

nvd.nist.gov/vuln/detail/CVE-2025-62848

MITRE CWE · CWE-476

NULL Pointer Dereference

Vendor Advisory

qnap.com/en/security-advisory/qsa-25-45