CVE-2021-28149 json
Hongdian H8922 3.0.5 devices allow Directory Traversal.
published 2021-05-06 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14847
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 15.9%
- EPSS 15.9% chance of exploitation in 30 days, percentile 96%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Exploit prediction
15.92% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Hongdian H8922 3.0.5 Devices - Local File Inclusion nuclei detection template
- ssd-disclosure.com https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
ssd-disclosure.com
/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/
exploit, third-party-advisory
-
en.hongdian.com
/Products/Details/H8922
product, vendor-advisory
Sources
- CVE List CVE-2021-28149
- NVD CVE-2021-28149
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