Security readout for executives and security teams
Plain-English summary
This flaw can let someone within Wi-Fi range send certain unencrypted traffic through a WPA2-protected router using listed Realtek chipsets. It is not described as full router takeover, but it can weaken network confidentiality and integrity for affected wireless deployments.
Executive priority
Handle as a targeted wireless infrastructure risk. Prioritize environments with affected Realtek-based routers supporting business, guest, or sensitive networks, especially where firmware support is unclear.
Technical view
CVE-2019-18990 is a partial authentication bypass affecting Realtek RTL8812AR 1.21WW, RTL8196D 1.0.0, RTL8192ER 2.10, and RTL8881AN 1.09 devices. An adjacent unauthenticated attacker may cause unencrypted data frames to be routed and receive encrypted responses, enabling information disclosure or possible data modification.
Likely exposure
Exposure is most likely in routers or embedded Wi-Fi devices using the listed Realtek chipsets and firmware versions. The source metadata does not name OEM products, so asset owners must map chipsets and firmware through device inventories or vendor documentation.
Exploitation context
The CVSS vector indicates adjacent-network access, low attack complexity, no privileges, and no user interaction. The bundle marks KEV as false and provides no cited evidence of active exploitation. Evidence supports wireless-range risk, not internet-scale remote exploitation.
Researcher notes
The provided affected-product metadata is sparse and lists vendor/product as n/a, while the description names chipsets and versions. No CWE, patch version, or operational workaround is provided in the bundle. Avoid broad product claims without OEM confirmation.
Mitigation direction
- Inventory WLAN devices for the listed Realtek chipsets and firmware versions.
- Check Realtek and OEM firmware guidance for CVE-2019-18990 fixes or mitigations.
- Isolate sensitive systems from affected WLAN segments until remediation is confirmed.
- Replace unsupported affected devices if no vendor-fixed firmware is available.
Validation and detection
- Confirm chipset and firmware versions from device records or management interfaces.
- Compare findings against RTL8812AR 1.21WW, RTL8196D 1.0.0, RTL8192ER 2.10, and RTL8881AN 1.09.
- Review vendor advisories for product-specific affected status and remediation.
- Validate WLAN segmentation limits access from guest or untrusted wireless clients.
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-2019-18990 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.