CVE-2022-27600 [Medium] | Denial of Service in Qts

An uncontrolled resource consumption vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following versions: QTS 5.0.1.2277 and later QTS 4.5.4.2280 build 20230112 and later QuTS hero h5.0.1.2277 build 20230112 and later QuTS hero h4.5.4.2374 build 20230417 and later QuTScloud c5.0.1.2374 and later

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.87%	0.57%	-0.29%
2	2026-01-27	0.75%	0.87%	+0.12%
3	2025-12-09	—	0.75%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.87%

0.57%

-0.29%

2026-01-27

0.75%

0.87%

+0.12%

2025-12-09

—

0.75%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.8	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. 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.	2.2	4.0	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/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:N) No account or special rights needed—anonymous or random user is enough. 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.	3.9	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.8

3.1

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.

2.2

4.0

[email protected]

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/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:N): No account or special rights needed—anonymous or random user is enough.
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.

3.9

3.6

[email protected]

Affected software / configurations for CVE-2022-27600

Vendor	Product	Version	Raw CPE
qnap	qts	>= 4.5.1, < 4.5.4.2280	cpe:2.3:o:qnap:qts::::::::
qnap	qts	>= 5.0.0, < 5.0.1.2277	cpe:2.3:o:qnap:qts::::::::
qnap	qts	4.5.4.2280	cpe:2.3:o:qnap:qts:4.5.4.2280:-::::::
qnap	qts	5.0.1.2277	cpe:2.3:o:qnap:qts:5.0.1.2277:-::::::
qnap	quts_hero	>= h4.5.1, < h4.5.4.2374	cpe:2.3:o:qnap:quts_hero::::::::
qnap	quts_hero	>= h5.0, < h5.0.1.2277	cpe:2.3:o:qnap:quts_hero::::::::
qnap	quts_hero	h4.5.4.2374	cpe:2.3:o:qnap:quts_hero:h4.5.4.2374:-::::::
qnap	quts_hero	h5.0.1.2277	cpe:2.3:o:qnap:quts_hero:h5.0.1.2277:-::::::
qnap	qutscloud	>= c5.0.1, < c5.0.1.2374	cpe:2.3:o:qnap:qutscloud::::::::

References for CVE-2022-27600

URL	Tags
https://www.qnap.com/en/security-advisory/qsa-23-09	Vendor Advisory

URL

CVE-2022-27600 | QTS, QuTS hero, QuTScloud

Exploit prediction scoring system (EPSS) score for CVE-2022-27600

Common vulnerability scoring system (CVSS) metrics for CVE-2022-27600

Weakness enumeration for CVE-2022-27600

Affected software / configurations for CVE-2022-27600

References for CVE-2022-27600