CVE intelligence and bounded remediation

CVE-2019-18990 — Realtek Rtl8812Ar Firmware security vulnerability

Medium CVSS 6.1

A partial authentication bypass vulnerability exists on Realtek RTL8812AR 1.21WW, RTL8196D 1.0.0, RTL8192ER 2.10, and RTL8881AN 1.09 devices. The vulnerability allows sending an unencrypted data frame to a WPA2-protected WLAN router where the packet is routed through the network. If successful, a response is sent back as an encrypted frame, which would allow an attacker to discern information or potentially modify data.

Severity
Medium
CVSS
6.1 (3.0)
Published
2020-09-30
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-290

Affected products

  • realtek / rtl8812ar_firmware / 1.21ww
  • realtek / rtl8196d_firmware / 1.0.0
  • realtek / rtl8192er_firmware / 2.10
  • realtek / rtl8881an_firmware / 1.09

Matched remediation archetype

Authentication bypass and missing authentication

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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