CVE•Published 2021-05-13•1 article on news•7 live references•NVD data

CVE-2021-28799

Vulnerability data via CVEDB (Shodan)

CVSS v3.1

10.0

CRITICAL

EPSS percentile

100

Exploit Prediction Scoring System · top 0% of all CVEs

Description

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 .

Timeline

Published 2021-05-13

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2021-28799

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Qnap Hybrid Backup Sync"

All exposed Qnap Hybrid Backup Sync instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Hybrid Backup Sync"

HTTP body or banner mentions "Hybrid Backup Sync" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-28799