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CVE-2026-47097 – Information Disclosure via Hardcoded AES Key – AJA HELO Plus < 2.1.7

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Summary

CVE-2026-47097 is a high-severity information disclosure vulnerability in AJA HELO Plus firmware. The device relies on a static AES passphrase embedded in obfuscated form within the firmware image to protect diagnostics export bundles served from an unauthenticated diagnostics endpoint, allowing anyone who recovers the passphrase from the firmware to decrypt sensitive diagnostics data from any affected device. The issue carries a CVSS v4.0 base score of 8.7 (High) and requires no authentication or user interaction to exploit remotely.

Technical details

  • Root cause: HELO Plus firmware prior to version 2.1.7 encrypts exported diagnostics bundles using a static, hardcoded AES passphrase (CWE-321: Use of Hard-coded Cryptographic Key). The passphrase is obfuscated within the firmware rather than being unique per device or user-supplied.
  • Trigger conditions: An attacker obtains the publicly available HELO Plus firmware image and reverse engineers it to recover the embedded AES passphrase. Because the same passphrase is shared across all affected units, it can be reused against any vulnerable device.
  • Attack vector: The device exposes an unauthenticated diagnostics endpoint (/diags) from which the encrypted diagnostics export bundle can be retrieved over the network without credentials. Once the attacker has the shared passphrase, the retrieved bundle can be decrypted offline.
  • Impact: Successful exploitation discloses the contents of the diagnostics bundle, described by the vulnerability record as "highly sensitive server information." The vulnerability affects confidentiality only — it does not impact integrity or availability.

Affected software

  • AJA HELO Plus firmware versions prior to 2.1.7 (all versions before 2.1.7 are affected)
  • Fixed in AJA HELO Plus firmware version 2.1.7

Severity

  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade all AJA HELO Plus units to firmware version 2.1.7 or later. This release changes the diagnostics export workflow so that the downloaded diagnostic archive is encrypted using a passphrase supplied by the user at export time, rather than a static value embedded in the firmware.
  • If patching cannot be performed immediately: Restrict network access to the HELO Plus management/diagnostics interface to trusted management networks only, and avoid exposing the device’s web/diagnostics interface directly to the internet, until the firmware update can be applied.

References

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