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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.

References

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