Security readout for executives and security teams
Plain-English summary
Some Netcomm routers can mistakenly treat unauthenticated requests as logged-in sessions when the URL looks like static content. That can expose protected content without credentials. The issue affects NF20, NF20MESH, and NL1902 devices running R6B025. The sources do not state that this CVE is actively exploited.
Executive priority
Treat this as a high-priority edge-device exposure issue. Routers often sit at network boundaries, and unauthenticated access to protected content can reveal sensitive configuration or operational data. Prioritize exposed management interfaces first, then internal-only devices.
Technical view
CVE-2022-4874 is a network-reachable authentication bypass caused by URL character checks for static assets. When strings such as static-file extensions are detected, the application performs a fake login, granting an active session for the request. CVSS 3.1 is 7.5, with no privileges or user interaction required and high confidentiality impact.
Likely exposure
Exposure is most likely where affected Netcomm NF20, NF20MESH, or NL1902 routers running R6B025 have management interfaces reachable from untrusted networks. The source bundle does not identify other firmware versions, products, or CPE entries.
Exploitation context
The vulnerability is low-complexity and remotely reachable, which increases practical risk. However, the bundle marks KEV as false and provides no cited evidence of active exploitation. The GitHub advisory title suggests broader research context, but this CVE record specifically supports authentication bypass and content access.
Researcher notes
The evidence supports CWE-288 authentication bypass through flawed static-content handling. Do not assume code execution, additional affected versions, or a vendor patch from this bundle alone. Validate by reviewing device model, firmware, access boundaries, and vendor advisory status.
Mitigation direction
- Inventory Netcomm NF20, NF20MESH, and NL1902 devices and confirm firmware versions.
- Restrict management access to trusted admin networks or VPN-only paths.
- Check Netcomm and CERT/CC guidance for fixed firmware or vendor mitigations.
- Monitor router logs for unauthenticated access attempts to protected management content.
- Replace or isolate affected devices if no supported fix is available.
Validation and detection
- Confirm whether any affected model is running firmware R6B025.
- Review management interface exposure from internet, guest, and untrusted internal networks.
- Verify administrative pages require authentication for non-static and static-looking URL paths.
- Check vendor or CERT/CC records for remediation status before closing the finding.
- Document any compensating controls restricting access to router administration interfaces.
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-288: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCredential 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-2022-4874 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/scarvell/advisories/blob/main/2022_netcomm_nf20mesh_unauth_rce.mdCVE reference
- https://www.kb.cert.org/vuls/id/986018CVE reference
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.
Authentication Bypass Using an Alternate Path or Channel
Authentication Bypass Using an Alternate Path or Channel represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.