How severe is CVE-2021-28813?

CVE-2021-28813 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2021-28813 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28813?

CVE-2021-28813 primarily affects Qnap Qunetswitch. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-28813?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-28813 published?

CVE-2021-28813 was published on 2021-09-10 and last updated on 2026-06-17.

CVE-2021-28813

CVE-2021-28813 is a critical-severity vulnerability in Qnap Qunetswitch with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-922.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-922
Affected product: Qnap Qunetswitch
Published: 2021-09-10
Last modified: 2026-06-17

Description

A vulnerability involving insecure storage of sensitive information has been reported to affect QSW-M2116P-2T2S and QNAP switches running QuNetSwitch. If exploited, this vulnerability allows remote attackers to read sensitive information by accessing the unrestricted storage mechanism.We have already fixed this vulnerability in the following versions: QSW-M2116P-2T2S 1.0.6 build 210713 and later QGD-1600P: QuNetSwitch 1.0.6.1509 and later QGD-1602P: QuNetSwitch 1.0.6.1509 and later QGD-3014PT: QuNetSwitch 1.0.6.1519 and later

Frequently asked questions

What is CVE-2021-28813?: A vulnerability involving insecure storage of sensitive information has been reported to affect QSW-M2116P-2T2S and QNAP switches running QuNetSwitch. If exploited, this vulnerability allows remote attackers to read sensitive information by accessing the unrestricted storage mechanism.We have already fixed this vulnerability in the following versions: QSW-M2116P-2T2S 1.0.6 build 210713 and later QGD-1600P: QuNetSwitch 1.0.6.1509 and later QGD-1602P: QuNetSwitch 1.0.6.1509 and later QGD-3014PT: QuNetSwitch 1.0.6.1519 and later
How severe is CVE-2021-28813?: CVE-2021-28813 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2021-28813 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28813?: CVE-2021-28813 primarily affects Qnap Qunetswitch. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-28813?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-28813 published?: CVE-2021-28813 was published on 2021-09-10 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-21-37

Affected products (2)

cpe:2.3:o:qnap:qsw-m2116p-2t2s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:qnap:qunetswitch:*:*:*:*:*:*:*:*

More vulnerabilities in Qnap Qunetswitch

CVE-2026-22901 — Critical (CVSS 9.8): A command injection vulnerability has been reported to affect QuNetSwitch. If a remote attacker gains a user account,…
CVE-2026-22900 — Critical (CVSS 9.8): A use of hard-coded credentials vulnerability has been reported to affect QuNetSwitch. The remote attackers can then…
CVE-2026-22897 — Critical (CVSS 9.8): A command injection vulnerability has been reported to affect QuNetSwitch. The remote attackers can then exploit the…
CVE-2026-22902 — Medium (CVSS 6.7): A command injection vulnerability has been reported to affect QuNetSwitch. If a local attacker gains an administrator…

All CVEs affecting Qnap Qunetswitch →

Other CWE-922 vulnerabilities

CVE-2025-12539 — Critical (CVSS 10.0): The TNC Toolbox: Web Performance plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions…
CVE-2023-32191 — Critical (CVSS 9.9): When RKE provisions a cluster, it stores the cluster state in a configmap called `full-cluster-state` inside the…
CVE-2023-29727 — Critical (CVSS 9.8): The Call Blocker application 6.6.3 for Android allows unauthorized applications to use exposed components to delete…
CVE-2021-42371 — Critical (CVSS 9.8): lpar2rrd is a hardcoded system account in XoruX LPAR2RRD and STOR2RRD before 7.30.
CVE-2021-27170 — Critical (CVSS 9.8): An issue was discovered on FiberHome HG6245D devices through RP2613. By default, there are no firewall rules for IPv6…
CVE-2020-8481 — Critical (CVSS 9.8): For ABB products ABB Ability™ System 800xA and related system extensions versions 5.1, 6.0 and 6.1, Compact HMI…

Browse all CWE-922 vulnerabilities →