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CVE-2020-2501

Stack Buffer Overflow in Surveillance Station

CRITICAL
9.8
CVSS Score
Published: February 17, 2021 at 03:25 AM UTC
Updated: June 17, 2026 at 03:12 AM UTC
2 products affected across 1 vendorSurveillance StationNAS

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

Description

A stack-based buffer overflow vulnerability has been reported to affect QNAP NAS devices running Surveillance Station. If exploited, this vulnerability allows attackers to execute arbitrary code. QNAP have already fixed this vulnerability in the following versions: Surveillance Station 5.1.5.4.3 (and later) for ARM CPU NAS (64bit OS) and x86 CPU NAS (64bit OS) Surveillance Station 5.1.5.3.3 (and later) for ARM CPU NAS (32bit OS) and x86 CPU NAS (32bit OS)

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Surveillance Station· Qnap
95%
v < 5.1.5.3.3v < 5.1.5.4.35.1.5.4.0 ≤ v < 5.1.5.4.3
Affected range stops below 5.1.5.3.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.1.5.4.3, so it looks safe — our inference, not a vendor statement
qnap-nas (environment)
NAS· Qnapdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.qnap.com/en/security-advisory/qsa-21-07

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-787

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