How severe is CVE-2021-28149?

CVE-2021-28149 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-28149 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28149?

CVE-2021-28149 affects Hongdian H8922 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28149?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-28149 published?

CVE-2021-28149 was published on 2021-05-06 and last updated on 2026-06-17.

CVE-2021-28149

CVE-2021-28149 is a medium-severity vulnerability in Hongdian H8922 Firmware with a CVSS 3.x base score of 6.5. Its EPSS exploit-prediction score of 14% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Hongdian H8922 Firmware
Published: 2021-05-06
Last modified: 2026-06-17

Description

Hongdian H8922 3.0.5 devices allow Directory Traversal. The /log_download.cgi log export handler does not validate user input and allows a remote attacker with minimal privileges to download any file from the device by substituting ../ (e.g., ../../etc/passwd) This can be carried out with a web browser by changing the file name accordingly. Upon visiting log_download.cgi?type=../../etc/passwd and logging in, the web server will allow a download of the contents of the /etc/passwd file.

Frequently asked questions

What is CVE-2021-28149?: Hongdian H8922 3.0.5 devices allow Directory Traversal. The /log_download.cgi log export handler does not validate user input and allows a remote attacker with minimal privileges to download any file from the device by substituting ../ (e.g., ../../etc/passwd) This can be carried out with a web browser by changing the file name accordingly. Upon visiting log_download.cgi?type=../../etc/passwd and logging in, the web server will allow a download of the contents of the /etc/passwd file.
How severe is CVE-2021-28149?: CVE-2021-28149 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-28149 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 14% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28149?: CVE-2021-28149 affects Hongdian H8922 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28149?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28149 published?: CVE-2021-28149 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-2021-28151 — High (CVSS 8.8): Hongdian H8922 3.0.5 devices allow OS command injection via shell metacharacters into the ip-address (aka Destination)…
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…

All CVEs affecting Hongdian H8922 Firmware →

Other CWE-22 (Path Traversal) vulnerabilities

CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…

Browse all CWE-22 (Path Traversal) vulnerabilities →