CVE-2025-47208 [Medium] | Security Vulnerability in Quts Hero

An allocation of resources without limits or throttling vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to prevent other systems, applications, or processes from accessing the same type of resource. We have already fixed the vulnerability in the following versions: QTS 5.2.6.3195 build 20250715 and later QuTS hero h5.2.6.3195 build 20250715 and later

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-31	0.16%	0.14%	-0.01%
2	2026-03-11	0.15%	0.16%	+0.01%
3	2026-01-03	—	0.15%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-31

0.16%

0.14%

-0.01%

2026-03-11

0.15%

0.16%

+0.01%

2026-01-03

—

0.15%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.9	4.0	MEDIUM	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network. Attack complexity (AC:L) Exploitation conditions are straightforward and stable. Attack requirements (AT:N) No additional preconditions are required beyond normal reachability. Privileges required (PR:L) Low privileges are required. User interaction (UI:N) No user interaction is required. Vulnerable system confidentiality impact (VC:N) No confidentiality impact on the vulnerable system. Vulnerable system integrity impact (VI:N) No integrity impact on the vulnerable system. Vulnerable system availability impact (VA:H) High availability impact on the vulnerable system. Subsequent system confidentiality impact (SC:N) No confidentiality impact on subsequent systems. Subsequent system integrity impact (SI:N) No integrity impact on subsequent systems. Subsequent system availability impact (SA:N) No availability impact on subsequent systems. Exploit maturity (threat) (E:U) Unreported: no public PoC, no reported exploitation, and no known simplification tools. Confidentiality requirement (CR:X) Not defined: insufficient information; scoring treats this like High (worst case). Integrity requirement (IR:X) Not defined: insufficient information; scoring treats this like High (worst case). Availability requirement (AR:X) Not defined: insufficient information; scoring treats this like High (worst case). Modified attack vector (MAV:X) Not defined: scoring uses the Base Attack Vector (AV). Modified attack complexity (MAC:X) Not defined: scoring uses the Base Attack Complexity (AC). Modified attack requirements (MAT:X) Not defined: scoring uses the Base Attack Requirements (AT). Modified privileges required (MPR:X) Not defined: scoring uses the Base Privileges Required (PR). Modified user interaction (MUI:X) Not defined: scoring uses the Base User Interaction (UI). Modified vulnerable system confidentiality impact (MVC:X) Not defined: scoring uses the Base VC metric. Modified vulnerable system integrity impact (MVI:X) Not defined: scoring uses the Base VI metric. Modified vulnerable system availability impact (MVA:X) Not defined: scoring uses the Base VA metric. Modified subsequent system confidentiality impact (MSC:X) Not defined: scoring uses the Base SC metric. Modified subsequent system integrity impact (MSI:X) Not defined: scoring uses the Base SI metric. Modified subsequent system availability impact (MSA:X) Not defined: scoring uses the Base SA metric. Safety (supplemental) (S:X) Not evaluated. Automatable (supplemental) (AU:X) Not evaluated. Recovery (supplemental) (R:X) Not evaluated. Value density (supplemental) (V:X) Not evaluated. Vulnerability response effort (supplemental) (RE:X) Not evaluated. Provider urgency (supplemental) (U:X) Not evaluated.	—	—	[email protected]
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.9

4.0

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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

Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L): Exploitation conditions are straightforward and stable.
Attack requirements (AT:N): No additional preconditions are required beyond normal reachability.
Privileges required (PR:L): Low privileges are required.
User interaction (UI:N): No user interaction is required.
Vulnerable system confidentiality impact (VC:N): No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N): No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H): High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N): No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N): No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N): No availability impact on subsequent systems.
Exploit maturity (threat) (E:U): Unreported: no public PoC, no reported exploitation, and no known simplification tools.
Confidentiality requirement (CR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X): Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X): Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X): Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X): Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X): Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X): Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X): Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X): Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X): Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X): Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X): Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X): Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X): Not evaluated.
Automatable (supplemental) (AU:X): Not evaluated.
Recovery (supplemental) (R:X): Not evaluated.
Value density (supplemental) (V:X): Not evaluated.
Vulnerability response effort (supplemental) (RE:X): Not evaluated.
Provider urgency (supplemental) (U:X): Not evaluated.

—

[email protected]

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

3.6

[email protected]

Affected software / configurations for CVE-2025-47208

Vendor	Product	Version	Raw CPE
qnap	quts_hero	h5.2.0.2737	cpe:2.3:o:qnap:quts_hero:h5.2.0.2737:build_20240417::::::
qnap	quts_hero	h5.2.0.2782	cpe:2.3:o:qnap:quts_hero:h5.2.0.2782:build_20240601::::::
qnap	quts_hero	h5.2.0.2789	cpe:2.3:o:qnap:quts_hero:h5.2.0.2789:build_20240607::::::
qnap	quts_hero	h5.2.0.2802	cpe:2.3:o:qnap:quts_hero:h5.2.0.2802:build_20240620::::::
qnap	quts_hero	h5.2.0.2823	cpe:2.3:o:qnap:quts_hero:h5.2.0.2823:build_20240711::::::
qnap	quts_hero	h5.2.0.2851	cpe:2.3:o:qnap:quts_hero:h5.2.0.2851:build_20240808::::::
qnap	quts_hero	h5.2.0.2860	cpe:2.3:o:qnap:quts_hero:h5.2.0.2860:build_20240817::::::
qnap	quts_hero	h5.2.1.2929	cpe:2.3:o:qnap:quts_hero:h5.2.1.2929:build_20241025::::::
qnap	quts_hero	h5.2.1.2940	cpe:2.3:o:qnap:quts_hero:h5.2.1.2940:build_20241105::::::
qnap	quts_hero	h5.2.2.2952	cpe:2.3:o:qnap:quts_hero:h5.2.2.2952:build_20241116::::::
qnap	quts_hero	h5.2.3.3006	cpe:2.3:o:qnap:quts_hero:h5.2.3.3006:build_20250108::::::
qnap	quts_hero	h5.2.4.3070	cpe:2.3:o:qnap:quts_hero:h5.2.4.3070:build_20250312::::::
qnap	quts_hero	h5.2.4.3079	cpe:2.3:o:qnap:quts_hero:h5.2.4.3079:build_20250321::::::
qnap	quts_hero	h5.2.5.3138	cpe:2.3:o:qnap:quts_hero:h5.2.5.3138:build_20250519::::::
qnap	quts_hero	h5.2.6.3195	cpe:2.3:o:qnap:quts_hero:h5.2.6.3195:build_20250715::::::
qnap	quts_hero	h5.3.0.3115	cpe:2.3:o:qnap:quts_hero:h5.3.0.3115:build_20250430::::::
qnap	quts_hero	h5.3.0.3145	cpe:2.3:o:qnap:quts_hero:h5.3.0.3145:build_20250530::::::
qnap	quts_hero	h5.3.0.3192	cpe:2.3:o:qnap:quts_hero:h5.3.0.3192:build_20250716::::::
qnap	qts	5.2.0.2737	cpe:2.3:o:qnap:qts:5.2.0.2737:build_20240417::::::
qnap	qts	5.2.0.2744	cpe:2.3:o:qnap:qts:5.2.0.2744:build_20240424::::::
qnap	qts	5.2.0.2782	cpe:2.3:o:qnap:qts:5.2.0.2782:build_20240601::::::
qnap	qts	5.2.0.2802	cpe:2.3:o:qnap:qts:5.2.0.2802:build_20240620::::::
qnap	qts	5.2.0.2823	cpe:2.3:o:qnap:qts:5.2.0.2823:build_20240711::::::
qnap	qts	5.2.0.2851	cpe:2.3:o:qnap:qts:5.2.0.2851:build_20240808::::::
qnap	qts	5.2.0.2860	cpe:2.3:o:qnap:qts:5.2.0.2860:build_20240817::::::
qnap	qts	5.2.1.2930	cpe:2.3:o:qnap:qts:5.2.1.2930:build_20241025::::::
qnap	qts	5.2.2.2950	cpe:2.3:o:qnap:qts:5.2.2.2950:build_20241114::::::
qnap	qts	5.2.3.3006	cpe:2.3:o:qnap:qts:5.2.3.3006:build_20250108::::::
qnap	qts	5.2.4.3070	cpe:2.3:o:qnap:qts:5.2.4.3070:build_20250312::::::
qnap	qts	5.2.4.3079	cpe:2.3:o:qnap:qts:5.2.4.3079:build_20250321::::::
qnap	qts	5.2.4.3092	cpe:2.3:o:qnap:qts:5.2.4.3092:build_20250403::::::
qnap	qts	5.2.5.3145	cpe:2.3:o:qnap:qts:5.2.5.3145:build_20250526::::::
qnap	qts	5.2.6.3195	cpe:2.3:o:qnap:qts:5.2.6.3195:build_20250715::::::
qnap	qts	5.2.6.3229	cpe:2.3:o:qnap:qts:5.2.6.3229:build_20250818::::::

References for CVE-2025-47208

URL	Tags
https://www.qnap.com/en/security-advisory/qsa-25-50	Vendor Advisory

URL

CVE-2025-47208 | QTS, QuTS hero

Exploit prediction scoring system (EPSS) score for CVE-2025-47208

Common vulnerability scoring system (CVSS) metrics for CVE-2025-47208

Weakness enumeration for CVE-2025-47208

Affected software / configurations for CVE-2025-47208

References for CVE-2025-47208