Security readout for executives and security teams
Plain-English summary
This NETGEAR router flaw can let someone on the same network segment view sensitive configuration data without logging in. The disclosed information may include stored credentials, which could help an attacker take further control. The source bundle does not show internet-wide exploitation or a confirmed patch version.
Executive priority
Treat this as a near-term network hygiene and credential-risk issue. It is not marked as known exploited in the supplied data, but unauthenticated disclosure of router credentials can materially increase compromise risk inside offices, branches, or shared networks.
Technical view
CVE-2021-34983 is a CWE-306 missing-authentication issue in NETGEAR router httpd, listening on TCP port 80 by default. The CVSS 3.0 score is 6.5 with adjacent-network attack vector, no privileges, no user interaction, and high confidentiality impact. ZDI tracked it as ZDI-CAN-13708.
Likely exposure
Exposure is most likely on NETGEAR devices whose management HTTP service is reachable from Wi-Fi, LAN, guest, or other adjacent networks. The bundle names Multiple Routers and version V1.0.11.116_10.2.100, but model coverage is incomplete here.
Exploitation context
The provided sources say authentication is not required and the attacker must be network-adjacent. CISA KEV status is false in the bundle, and no cited source here states active exploitation. The main risk is disclosure of stored credentials enabling follow-on compromise.
Researcher notes
The bundle lacks exact model enumeration, fixed versions, and detailed vendor mitigation text. The NETGEAR advisory title in the bundle references a different vulnerability class, so verify the advisory mapping before making product-specific claims.
Mitigation direction
- Check the NETGEAR advisory for exact affected models and fixed firmware.
- Update affected devices according to NETGEAR guidance for the exact model.
- Restrict router management access to trusted administrative networks only.
- Disable remote or unnecessary HTTP management if vendor settings allow it.
- Rotate credentials stored on or managed through affected devices.
Validation and detection
- Inventory NETGEAR routers, extenders, and DSL modem routers in scope.
- Record model numbers and firmware versions, especially V1.0.11.116_10.2.100.
- Confirm whether TCP port 80 management is reachable from untrusted adjacent networks.
- Review NETGEAR advisory coverage against each discovered model.
- Check for unexpected configuration changes or credential exposure indicators.
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-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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-2021-34983 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
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/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:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ZDI-21-1275CVE reference · x_research-advisory
- vendor-provided URLCVE reference · vendor-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.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.