How severe is CVE-2021-28151?

CVE-2021-28151 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28151 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28151?

CVE-2021-28151 affects Hongdian H8922 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28151?

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

When was CVE-2021-28151 published?

CVE-2021-28151 was published on 2021-05-06 and last updated on 2026-06-17.

CVE-2021-28151

CVE-2021-28151 is a high-severity vulnerability in Hongdian H8922 Firmware with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 28% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 28% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Hongdian H8922 Firmware
Published: 2021-05-06
Last modified: 2026-06-17

Description

Hongdian H8922 3.0.5 devices allow OS command injection via shell metacharacters into the ip-address (aka Destination) field to the tools.cgi ping command, which is accessible with the username guest and password guest.

Frequently asked questions

What is CVE-2021-28151?: Hongdian H8922 3.0.5 devices allow OS command injection via shell metacharacters into the ip-address (aka Destination) field to the tools.cgi ping command, which is accessible with the username guest and password guest.
How severe is CVE-2021-28151?: CVE-2021-28151 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28151 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28151?: CVE-2021-28151 affects Hongdian H8922 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28151?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28151 published?: CVE-2021-28151 was published on 2021-05-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:hongdian:h8922_firmware:3.0.5:*:*:*:*:*:*:*

More vulnerabilities in Hongdian H8922 Firmware

CVE-2021-28152 — Critical (CVSS 9.8): Hongdian H8922 3.0.5 devices have an undocumented feature that allows access to a shell as a superuser. To connect, the…
CVE-2021-28149 — Medium (CVSS 6.5): Hongdian H8922 3.0.5 devices allow Directory Traversal. The /log_download.cgi log export handler does not validate user…
CVE-2021-28150 — Medium (CVSS 5.5): Hongdian H8922 3.0.5 devices allow the unprivileged guest user to read cli.conf (with the administrator password and…

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