Security readout for executives and security teams
Plain-English summary
This is an authentication bypass in several older NETGEAR routers and modem routers. An attacker who can reach the affected device locally could bypass normal login controls and potentially compromise confidentiality, integrity, and availability. Risk is highest where these devices remain on old firmware or expose administration to untrusted local networks.
Executive priority
Treat this as a high-priority network-edge hygiene issue for any listed NETGEAR device still in service. The main urgency is reducing preventable compromise risk from outdated firmware and exposed local administration, not responding to confirmed active exploitation.
Technical view
CVE-2017-18850 affects specified NETGEAR D-series and R-series models below listed firmware versions. CVSS 3.0 is 8.4 with AV:L, AC:L, PR:N, UI:N, and high C/I/A impact. The bundle identifies authentication bypass but not root cause, endpoint details, or CWE classification.
Likely exposure
Likely exposure is older NETGEAR D6220, D6400, D8500, and multiple R-series routers running firmware earlier than the fixed versions listed by NETGEAR and CVE. The CVSS vector indicates local attack access, so inventory should focus on devices reachable from local wired, Wi-Fi, or management networks.
Exploitation context
The provided sources do not state active exploitation, and the CVE is not marked KEV. Public evidence in the bundle supports a high-severity authentication bypass with local attack vector, but does not provide exploit maturity, observed campaigns, or proof-of-concept status.
Researcher notes
The source material is sparse: it names affected models, fixed-version thresholds, CVSS, and authentication bypass. It does not include technical root cause, affected components, exploit preconditions beyond CVSS local access, or vendor workaround details beyond advisory-driven firmware remediation.
Mitigation direction
- Update affected NETGEAR devices to the fixed firmware version or later.
- Use the NETGEAR advisory to confirm the exact firmware target for each model.
- Restrict router administration access to trusted local management networks.
- Disable unnecessary management exposure until firmware status is verified.
- Replace devices that cannot receive fixed firmware.
Validation and detection
- Inventory NETGEAR router and modem-router models against the affected list.
- Record current firmware versions and compare them with NETGEAR's fixed-version thresholds.
- Confirm administrative interfaces are not reachable from untrusted local or guest networks.
- Check vulnerability management records for CVE-2017-18850 coverage and closure evidence.
- Document exceptions where devices are retired, isolated, or vendor guidance is unavailable.
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-2017-18850 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
- 8.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI: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:3.0/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:N2.55.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.4HighVector: CVSS:3.0/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000048998/Security-Advisory-for-Authentication-Bypass-on-Some-Routers-or-Modem-Routers-PSV-2017-1208CVE reference · x_refsource_CONFIRM
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.