CVE-2021-28149 (GCVE-0-2021-28149)

Vulnerability from cvelistv5 – Published: 2021-05-06 15:12 – Updated: 2024-08-03 21:40
VLAI Shadowserver Previdian
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 27/100 over 2368 records in the last 180 days details
References
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 439cfc4f-8c8a-4dc1-ad4b-1af056a3f9c7

Vulnerability ID: CVE-2021-28149

Status: Confirmed

Status Updated: 2026-07-17 00:00 UTC

Exploited: Yes

Characteristics
Severity: 65.0
Timestamps
First Seen: 2023-10-23
Asserted: 2023-10-23
Last Seen: 2026-07-17
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Hongdian / Hongdian H8922 | Class: router | Severity: Medium (CVSS 6.5) | IoT: yes | In CISA KEV: no | Honeypot connections on 2026-07-17: 2
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 0
Vendor Hongdian
30D Avg 0
90D Avg 0
Product Hongdian H8922
Cisa Kev no
Connections 2
Observation Date 2026-07-17
Vulnerability Class CVSS
Vulnerability Score 6.5
Vulnerability Severity Medium
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-19 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e7e0450-4ada-4828-9018-51fe5dcb7d18

Vulnerability ID: CVE-2021-28149

Status: Confirmed

Status Updated: 2021-05-06 15:12 UTC

Exploited: Yes

Timestamps
First Seen: 2021-05-06
Asserted: 2021-05-06
Scope
Notes: KEVIntel entry: 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... | Affected: n/a / n/a | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor n/a
Product n/a
Added Date 2021-05-06T15:12:30.000Z
Cvss Score None
Epss Score None
Cvss Severity None
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:06 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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