Security readout for executives and security teams
Plain-English summary
CVE-2018-21202 is a high-severity pre-authentication stack overflow in specific NETGEAR routers and gateways. An unauthenticated attacker on an adjacent network could affect confidentiality, integrity, and availability. Prioritize devices providing routing, Wi-Fi, VPN, or gateway functions.
Executive priority
Treat this as a high-priority network appliance remediation item. The vulnerability is pre-authentication and could affect core connectivity devices, but the provided sources do not show confirmed active exploitation.
Technical view
The CVSS 3.0 vector is 8.8 high: AV:A/AC:L/PR:N/UI:N with high confidentiality, integrity, and availability impact. The source identifies a stack-based buffer overflow before specific NETGEAR firmware versions. The bundle does not include CWE mapping or detailed vulnerable interface information.
Likely exposure
Exposure is limited to the listed NETGEAR models running firmware before the named fixed versions: D7800, R6100, R7500, R7500v2, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, and WNDR4500v3.
Exploitation context
The bundle describes unauthenticated attack potential and an adjacent attack vector. It does not cite public exploitation, exploit code, or CISA KEV listing, so active exploitation should not be assumed from these sources alone.
Researcher notes
The public bundle is sparse. It supports product and version scoping, CVSS severity, and vendor advisory linkage, but not root-cause details, endpoint names, exploitability testing, or operational indicators.
Mitigation direction
- Upgrade affected NETGEAR devices to the fixed firmware versions or later listed by the vendor.
- Check the NETGEAR advisory for model-specific firmware guidance before making changes.
- Replace unsupported or unpatchable affected devices.
- Restrict management and local network exposure where immediate firmware updates are delayed.
Validation and detection
- Inventory NETGEAR router and gateway models in use.
- Compare installed firmware against the fixed versions listed in the CVE description.
- Confirm updates through device administration or centralized asset records.
- Review network placement for affected devices with adjacent-network reachability.
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-2018-21202 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
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/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:A/A:H/C:H/I:H/PR:N/S:U/UI:N2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AC:L/AV:A/A:H/C:H/I:H/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.netgear.com/000055147/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-Some-Routers-and-Gateways-PSV-2017-2590CVE 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.