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CVE-2026-18753 – Hard-coded RSA Private Key (HTTPS Decryption / Server Spoofing) – GeoVision GV-AS16

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Summary

CVE-2026-18753 is a use of hard-coded cryptographic key vulnerability (CWE-321) in the GeoVision GV-AS1620 (AS-Manager) access control controller. The firmware ships with an embedded, static RSA private key used by the Lighttpd web server for TLS termination, allowing a network attacker to decrypt and tamper with HTTPS traffic or impersonate the device. It carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The product firmware contains an embedded, static RSA private key utilized by the Lighttpd web server for TLS termination (CWE-321).
  • Trigger conditions: Extraction of the shared private key from the firmware, after which it can be reused against any device carrying the same key.
  • Attack vector: Network (AV:N); no authentication or user interaction required.
  • Impact: Exposure of the private key enables an attacker to decrypt HTTPS communications, breach the confidentiality and integrity of encrypted traffic, and spoof the server (token impersonation).

Affected software

  • GeoVision GV-AS1620 (AS-Manager) firmware V2.07 on Linux.

Severity

  • CVSS v3.1 base score: 9.1 (Critical)
  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade GV-AS1620 (AS-Manager) firmware to V2.08, which addresses the issue.
  • If no patch can be applied: Restrict network access to the device’s HTTPS interface, segment it away from untrusted networks, and avoid exposing the management interface directly to the internet.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: GV-AS1620

References

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