Which versions of GX Earth ONT are affected by EUVD-2026-34251?

GX Earth 2022 Optical Network Terminals deployed in production contain a hardcoded RSA private key in firmware, enabling attackers to decrypt encrypted management communications and intercept…

How to fix or mitigate EUVD-2026-34251?

Within 24 hours: Inventory all GX Earth 2022 ONT firmware versions using CERT-In CIVN-2026-0288 guidance; isolate device management networks from untrusted segments with network segmentation. Within 7 days: Implement dedicated management VLANs with strict access controls; disable remote management protocols where operationally feasible; enable comprehensive logging of all device management access and configuration changes. Within 30 days: Develop hardware replacement strategy with vendor; evaluate alternative ONT solutions; conduct audit of management traffic logs for indicators of unauthorized access.

GX Earth ONT EUVD-2026-34251

Q: What is the CVSS score of EUVD-2026-34251?

EUVD-2026-34251 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.1%.

| CVE-2026-45433 HIGH

Use of Hard-coded Cryptographic Key (CWE-321)

2026-06-04 CERT-In

GHSA-5h68-jg5g-w367

Information Disclosure Gx Earth 2022 Gx Earth 1010

8.7

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Jun 04, 2026 - 16:20 vuln.today

CVSS changed

Jun 04, 2026 - 14:22 NVD

8.7 (HIGH)

CVE Published

Jun 04, 2026 - 12:13 nvd

UNKNOWN (no severity yet)

DescriptionCVE.org

This vulnerability exists in GX Earth 2022 ONT models due to the presence of hardcoded RSA private key within the device firmware. A remote attacker could exploit this vulnerability by extracting the cryptographic private key from the firmware, which could lead to decryption of HTTPS traffic and Man-in-the-Middle (MITM) attacks on the targeted device.

AnalysisAI

Hardcoded RSA private key in GX Earth 2022 ONT (Optical Network Terminal) firmware allows remote attackers to extract the embedded cryptographic material and decrypt HTTPS sessions or perform man-in-the-middle attacks against device management traffic. CERT-In disclosed the issue (CIVN-2026-0288) affecting multiple GX India fiber ONT models and firmware versions, with no public exploit identified at time of analysis but SSVC flagging the flaw as fully automatable once the key is recovered.

Technical ContextAI

GX Earth devices are Optical Network Terminals (ONTs) - customer-premises equipment used in GPON/EPON fiber-to-the-home deployments to terminate the fiber link and provide LAN/Wi-Fi services. The root cause is CWE-321 (Use of Hard-coded Cryptographic Key): the same RSA private key is compiled into every shipped firmware image, so any attacker who extracts the firmware (via UART, flash dump, or a publicly distributed update package) gains the identical key used across the entire device fleet. Because the key terminates the TLS/HTTPS session of the device's management interface, possession breaks the confidentiality and authenticity guarantees TLS is meant to provide.

RemediationAI

No vendor-released patch identified at time of analysis; the CERT-In advisory (https://www.cert-in.org.in/s2cMainServlet?pageid=PUBVLNOTES01&VLCODE=CIVN-2026-0288) is currently the only authoritative reference, so operators should contact GX India directly for firmware that replaces the hardcoded RSA key with a per-device-generated key. Compensating controls until a fix ships: restrict access to the ONT web/HTTPS management interface to a dedicated management VLAN or the ISP's provisioning network (side effect: subscribers lose local GUI access), disable remote management (TR-069/HTTPS-WAN) on the WAN side if the deployment allows it, segregate ONT traffic from user LAN traffic to make on-path interception harder, and monitor for unexpected TLS sessions to the device. Because the key is identical across the fleet, simply rotating credentials or disabling individual users does not mitigate the issue - the key itself must be replaced.