Security readout for executives and security teams
Plain-English summary
CVE-2019-18989 affects Mediatek MT7620N 1.06 devices. A nearby attacker may be able to send an unencrypted frame into a WPA2-protected router and receive an encrypted response, creating limited confidentiality or integrity risk on local wireless networks.
Executive priority
Treat as a moderate-priority network hygiene issue. It is not documented as actively exploited here, but affected wireless routers can create localized exposure near offices, branches, or customer sites.
Technical view
The CVE describes a partial authentication bypass on MT7620N 1.06 devices. The CVSS 3.0 vector is adjacent-network, low complexity, no privileges, no user interaction, with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is most likely where Mediatek MT7620N 1.06-based wireless routers remain deployed and reachable by people within Wi-Fi radio range. The source data does not identify specific router brands or CPEs.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires adjacent wireless proximity, not remote internet access, based on the CVSS adjacent-network vector and WLAN description.
Researcher notes
Evidence is limited to the CVE record and Synopsys advisory reference. Affected vendor/product metadata is incomplete, and no specific patch version is provided in the bundle. Avoid expanding scope beyond MT7620N 1.06 without vendor confirmation.
Mitigation direction
- Inventory wireless routers for MT7620N 1.06 firmware or chipset use.
- Check vendor and Synopsys guidance for firmware updates or replacement direction.
- Restrict physical and radio proximity to affected wireless networks where practical.
- Segment affected WLANs from sensitive internal systems.
- Replace devices if no maintained vendor fix is available.
Validation and detection
- Confirm device model, chipset, and firmware version from authorized asset records.
- Map whether affected devices bridge into sensitive network segments.
- Review WLAN monitoring for unusual unauthenticated or malformed frame activity.
- Validate remediation status against vendor documentation, not assumed patch names.
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-2019-18989 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
- 6.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:N/S:C/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:N/C:L/I:L/PR:N/S:C/UI:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.1MediumVector: CVSS:3.0/AC:L/AV:A/A:N/C:L/I:L/PR:N/S:C/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synopsys.com/blogs/software-security/cyrc-advisory-sept2020/CVE 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.