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CVE-2021-28799

CVE.org · Published

Historical CVEsJSONAI instructions

Record status
Published
Identifier year (not publication year)
2021
Source publication
Source updated
Imported by cveboard
Source snapshot
cve_2026-10-24_midnight_baseline ·

Plain text

CNA source text (English)

Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)

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 .

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

HBS 3

Vendor
QNAP Systems Inc.
Product
HBS 3
Platforms
  • QTS 4.5.2
Default status
Unknown
HBS 3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
unspecifiedaffectedcustomv16.0.0415UnavailableNone listed

HBS 3

Vendor
QNAP Systems Inc.
Product
HBS 3
Platforms
  • QTS 4.3.6
Default status
Unknown
HBS 3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
unspecifiedaffectedcustomv3.0.210412UnavailableNone listed

HBS 3

Vendor
QNAP Systems Inc.
Product
HBS 3
Platforms
  • QTS 4.3.4
Default status
Unknown
HBS 3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
unspecifiedaffectedcustomv3.0.210411UnavailableNone listed

HBS 3

Vendor
QNAP Systems Inc.
Product
HBS 3
Platforms
  • QTS 4.3.3
Default status
Unknown
HBS 3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
unspecifiedaffectedcustomv3.0.210411UnavailableNone listed

HBS 3

Vendor
QNAP Systems Inc.
Product
HBS 3
Platforms
  • QuTS hero h4.5.1
Default status
Unknown
HBS 3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
unspecifiedaffectedcustomv16.0.0419UnavailableNone listed

HBS 3

Vendor
QNAP Systems Inc.
Product
HBS 3
Platforms
  • QuTScloud c4.5.1~c4.5.4
Default status
Unknown
HBS 3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
unspecifiedaffectedcustomv16.0.0419UnavailableNone listed

HBS 2

Vendor
QNAP Systems Inc.
Product
HBS 2
Platforms
Unknown
Default status
Unknown
HBS 2 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
all versionsunaffectedUnavailableUnavailableUnavailableNone listed

HBS 1.3

Vendor
QNAP Systems Inc.
Product
HBS 1.3
Platforms
Unknown
Default status
Unknown
HBS 1.3 · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
all versionsunaffectedUnavailableUnavailableUnavailableNone listed