CVE-2021-28799

critical · 10Actively exploited

On the CISA Known Exploited Vulnerabilities catalog

Apply updates per vendor instructions.

Added 2022-03-31Remediation due 2022-04-21

A public exploit / detection template exists

Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →

An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .

CVSS

78.3%

EPSS (exploit prob.)

100th

EPSS percentile

2021-05-13

Published

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

Weaknesses

CWE-285

Affected products

Vendor	Product	Affected versions
qnap	hybrid_backup_sync	< 16.0.0415
qnap	qts	4.5.2
qnap	hybrid_backup_sync	< 3.0.210412
qnap	qts	4.3.6
qnap	hybrid_backup_sync	< 3.0.210411
qnap	qts	4.3.3
qnap	qts	4.3.4
qnap	hybrid_backup_sync	< 16.0.0419
qnap	quts_hero	h4.5.1
qnap	hybrid_backup_sync	< 16.0.0419
qnap	qutscloud	>= c4.5.1, <= c4.5.4

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2021-28799