Security readout for executives and security teams
Plain-English summary
CVE-2021-47820 affects Ubee EVW327 routers. It can let an attacker change the router setting that enables remote access, potentially exposing management access on port 8080. This is a configuration-integrity issue, not a direct data theft flaw. Public exploit information exists, but the provided sources do not show known active exploitation.
Executive priority
Treat as a near-term network hygiene issue. It is medium severity, but it can expose router administration and create a pathway for further compromise if management access becomes reachable. Prioritize environments still using Ubee EVW327 devices, especially ISP-managed or unmanaged edge routers.
Technical view
The issue is a cross-site request forgery weakness in the Ubee EVW327 web interface. Sources state a crafted webpage can automatically submit a settings change that enables remote access on port 8080 without the user’s consent. The CVSS v3.1 score is 5.3, with low attack complexity and low integrity impact.
Likely exposure
Organizations or households using Ubee EVW327 devices are potentially exposed, especially where administrators browse the web from networks that can reach the router management interface. Exposure is higher if remote access is already enabled or if device management settings are not monitored.
Exploitation context
ExploitDB and VulnCheck list public exploit/advisory material, so defenders should assume the technique is publicly understood. The source bundle does not identify CISA KEV inclusion or confirmed in-the-wild exploitation. The practical risk is unauthorized enabling of remote administration, which can increase follow-on attack surface.
Researcher notes
Evidence is limited to the CVE description, VulnCheck advisory, ExploitDB reference, and vendor homepage. No patch version, firmware range, or official mitigation is named in the provided sources. Do not infer other Ubee models are affected without separate evidence.
Mitigation direction
- Check Ubee or ISP guidance for firmware updates or configuration recommendations.
- Disable remote access unless explicitly required for managed support.
- Restrict router management access to trusted local administration paths.
- Avoid browsing untrusted sites from sessions that can reach router administration pages.
- Monitor router configuration for unexpected remote access changes.
Validation and detection
- Inventory networks for Ubee EVW327 devices.
- Review router settings for remote access enabled on port 8080.
- Confirm whether vendor or ISP firmware guidance exists for deployed devices.
- Check logs or configuration history for unexpected management setting changes.
- Verify administrative access is limited to trusted users and networks.
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.
CWE-352: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-47820 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
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49920CVE reference · exploit
- Ubee Interactive Official HomepageCVE reference · product
- VulnCheck Advisory: Ubee EVW327 - 'Enable Remote Access' Cross-Site Request Forgery (CSRF)CVE reference · third-party-advisory
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.
Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.