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Back to active CVEs
Critical · CVSS 9.8CVE-2026-76071

Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost ParameterCVE-2026-76071

Answer in brief

CVE-2026-76071 records a Critical severity (CVSS 9.8) vulnerability in Netis NC63 V3.0.0.3327 Stack Buffer Overflow via destHost Parameter. The current sources do not mark it as known exploited. The current feed maps Netis Systems/NC63 (generic), Netis Systems/NC63 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 24, 2026Updated Sep 24, 2026Source checked Oct 8, 2026First seen by HOL Aug 24, 2026Material review Sep 24, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Netis Systems/NC63 (generic), Netis Systems/NC63 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Netis Systems/NC63generic0Not reported
Netis Systems/NC63generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Netis Systems/NC63, Netis Systems/NC63.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 24, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referenceozcanpng.dev
  • Source referencenetis-systems.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Poppler 0.42.0 through 26.10.0 Stack Buffer Overflow via Decrypt::revision6Hash()Also CWE-121
  • Fail-open response masking in Docker Sandboxes can expose proxy-managed credentialsSame generic ecosystem
  • TVU Networks Receiver/Transceiver Authentication Bypass via /tvu/LoginSame generic ecosystem
  • TVU Networks Receiver/Transceiver Missing Authentication via REST APISame generic ecosystem
  • Docker Sandboxes egress proxy could forward unrecognized client credentials to managed hostsSame generic ecosystem
  • Command InjectionSame generic ecosystem

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Oct 8, 2026
References
4 linked sources
Open source record