Security readout for executives and security teams
Plain-English summary
This vulnerability can let someone change the administrator password on an Acexy Wireless-N WiFi Repeater without logging in first. If the device’s web management page is reachable, an attacker who knows or guesses the admin username could lock out the owner and take control of the repeater.
Executive priority
Treat this as a priority for small-office, branch, or unmanaged network environments using this repeater. The business risk is device takeover and loss of network control, especially if management access is exposed beyond trusted administrators.
Technical view
CVE-2021-28936 affects Acexy Wireless-N WiFi Repeater REV 1.0 firmware 28.08.06.1. The CVE states the web management administrator password can be changed through a specially crafted HTTP GET request, with no prior authentication required. The administrator username must be known; the default is reported as admin.
Likely exposure
Exposure is most likely where this repeater model and firmware are still deployed and the web management interface is reachable from untrusted networks, guest WiFi, or the internet. The source bundle does not provide CPEs or a complete affected-version list.
Exploitation context
No CISA KEV listing or cited source confirms active exploitation. Exploitation would require network reachability to the device’s HTTP management interface and knowledge or guessing of the administrator username, which may be the default admin.
Researcher notes
The public record lacks CVSS, CWE, CPE, and patch-status details. The core issue is unauthenticated password change via HTTP GET on the named repeater firmware. Do not assume broader Acexy product impact without additional vendor or researcher evidence.
Mitigation direction
- Identify any Acexy Wireless-N WiFi Repeater REV 1.0 devices in use.
- Restrict web management access to trusted administration networks only.
- Disable remote web management if that option exists.
- Change default administrator usernames and passwords where supported.
- Check vendor or supplier guidance for firmware updates or replacement advice.
- Replace devices if no supported fixed firmware is available.
Validation and detection
- Confirm device model and firmware version from asset records or the management interface.
- Verify the management interface is not reachable from the internet or untrusted segments.
- Review configuration for default administrator username use.
- Check whether unauthorized password or configuration changes occurred.
- Document compensating controls if no vendor fix is available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-28936 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://blog-ssh3ll.medium.com/acexy-wireless-n-wifi-repeater-vulnerabilities-8bd5d14a2990CVE reference, mitre
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.