Security readout for executives and security teams
Plain-English summary
OpenWrt 21.02.1 reportedly has a cross-site scripting issue in the Port Forwards Add Name screen. A malicious value could run script in a user’s browser when viewed in the management interface. The source bundle does not provide CVSS, affected build range beyond 21.02.1, or a fixed version.
Executive priority
Treat this as a targeted management-interface risk, not a confirmed emergency. Prioritize if OpenWrt administration is reachable by untrusted users or exposed networks.
Technical view
CVE-2021-45904 describes XSS in OpenWrt 21.02.1 tied to the LuCI Port Forwards Add Name workflow. The available record is sparse: no CWE, CVSS vector, authentication prerequisites, patch reference, or exploit evidence are included in the supplied sources.
Likely exposure
Exposure appears limited to OpenWrt 21.02.1 systems where the web administration interface and port-forward management are accessible to users or administrators. The bundle does not identify other versions or distributions.
Exploitation context
The source bundle does not show active exploitation, and KEV is false. Practical risk depends on who can access the web UI and whether attacker-controlled text can be saved or displayed in the affected screen.
Researcher notes
Evidence is incomplete. The CVE description names XSS in a specific OpenWrt 21.02.1 UI screen, but lacks root cause, privilege requirements, CVSS, fixed version, and confirmed exploit details.
Mitigation direction
- Inventory OpenWrt devices and identify any running version 21.02.1.
- Restrict web administration access to trusted management networks only.
- Check OpenWrt bug tracker and release guidance for fixed versions.
- Apply vendor-supported updates when a verified fix path is confirmed.
- Review admin accounts and remove unnecessary access.
Validation and detection
- Confirm whether any managed devices run OpenWrt 21.02.1.
- Verify the web admin interface is not internet-accessible.
- Review access logs for unexpected LuCI administration activity.
- Perform safe authenticated validation that displayed names are properly encoded.
- Track the referenced OpenWrt issue for remediation status.
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.
CVE-2021-45904 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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.openwrt.org/index.php?do=details&task_id=4199CVE reference · x_refsource_MISC
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.