Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-76071

CVE-2026-76071CRITICAL

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   H   H   H    9.3   .0142   71.9     —

AFFECTED
  Product  Versions     Fixed
  NC63     unspecified  —

TIMELINE
  Aug 18  Reserved by VulnCheck
  Aug 24  EXPLOIT PUBLISHED — CVE-2026-76071 (Netis Systems NC63). Public exploit reference added.
  Aug 24  Published (CNA: VulnCheck)
  Aug 26  EXPLOIT PUBLISHED — CVE-2026-76071 (Netis Systems NC63). Public exploit reference added.

CWE-121 · CNA: VulnCheck · CVSS v4.0 · 4 references · NVD status: Deferred

Description

Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by supplying an oversized destHost parameter to the ipFilterList=mod action in netis.cgi. Attackers can exploit widthless sscanf conversions that copy user-supplied input into fixed-size stack buffers before authentication is verified, achieving remote code execution as root due to the Boa web server executing the CGI environment with root privileges.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 18, 2026	Reserved	Reserved by VulnCheck
August 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-76071 (Netis Systems NC63). Public exploit reference added.
August 24, 2026	Published	Published (CNA: VulnCheck)
August 26, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-76071 (Netis Systems NC63). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Netis Systems	NC63	—	—	—

Weaknesses

CWE-121

References (4)

Authoritative record: CVE-2026-76071 at cve.org

Vendors: netis systems

Weaknesses: CWE-121

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-76071 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.