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CVE-2024-21899

44
FAUCET Score

CVE-2024-21899 is a critical improper authentication vulnerability affecting multiple QNAP operating system versions, including QTS, QuTS hero, and QuTScloud. With a CVSS score of 9.8, this vulnerability allows unauthenticated attackers to compromise system security remotely over a network, leading to full confidentiality, integrity, and availability impact. While there is no known active exploitation or public exploit code, the vulnerability has garnered significant community discussion and media coverage, indicating high awareness. QNAP has released patches for affected versions, and users are urged to update immediately.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.5.4.2627CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
>= 5.1.0, < 5.1.3.2578CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
4.5.4.2627CPE matchmatch criteria
cpe:2.3:o:qnap:qts:4.5.4.2627:-:*:*:*:*:*:*
5.1.3.2578CPE matchmatch criteria
cpe:2.3:o:qnap:qts:5.1.3.2578:-:*:*:*:*:*:*
< h4.5.4.2626CPE matchmatch criteria
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
24.37%
Probability of exploitation in next 30 days
EPSS Percentile
97.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.2437 is in the 94th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

qnap.com / en/security-advisory/qsa-24-09
Vendor Advisory