CVE intelligence and bounded remediation

CVE-2019-19494 — Sagemcom F@St 3890 Firmware security vulnerability

High CVSS 9.3

Broadcom based cable modems across multiple vendors are vulnerable to a buffer overflow, which allows a remote attacker to execute arbitrary code at the kernel level via JavaScript run in a victim's browser. Examples of affected products include Sagemcom F@st 3890 prior to 50.10.21_T4, Sagemcom F@st 3890 prior to 05.76.6.3f, Sagemcom F@st 3686 3.428.0, Sagemcom F@st 3686 4.83.0, NETGEAR CG3700EMR 2.01.05, NETGEAR CG3700EMR 2.01.03, NETGEAR C6250EMR 2.01.05, NETGEAR C6250EMR 2.01.03, Technicolor TC7230 STEB 01.25, COMPAL 7284E 5.510.5.11, and COMPAL 7486E 5.510.5.11.

Severity
High
CVSS
9.3 (2.0)
Published
2020-01-09
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-120

Affected products

  • sagemcom / f@st_3890_firmware
  • sagemcom / f@st_3686_firmware / 3.428.0
  • sagemcom / f@st_3686_firmware / 4.83.0
  • netgear / cg3700emr_firmware / 2.01.03
  • netgear / cg3700emr_firmware / 2.01.05
  • netgear / c6250emr_firmware / 2.01.03

Showing 6 representative product identities from 11 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Buffer bounds, memory safety, and memory corruption

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

Check exposure

  • Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
  • Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
  • Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.

Remediate safely

  • Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
  • Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
  • Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.

Authoritative sources

Complete CVE record and remediation plan

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