CVE-2026-49006: Device Firmware Credential Disclosure Flaw

CVE-2026-49006 Overview

CVE-2026-49006 is a firmware information disclosure vulnerability affecting a ZTE device. Attackers with adjacent network access can extract unencrypted credentials used for Transport Layer Security (TLS) transmission directly from the device firmware. The weakness is classified under [CWE-321] Use of Hard-coded Cryptographic Key. Exposure of these credentials enables adversaries to decrypt or impersonate TLS-protected communications between the affected device and its endpoints. The ZTE Security Bulletin documents the affected products and remediation.

Critical Impact
Recovery of embedded TLS credentials allows adjacent-network attackers to compromise confidentiality of encrypted communications originating from the affected device.

Affected Products

ZTE device firmware referenced in the vendor bulletin
Specific product models and firmware versions are listed in the ZTE Security Bulletin
No additional affected products are enumerated in the NVD record

Discovery Timeline

2026-08-07 - CVE-2026-49006 published to NVD
2026-08-07 - Last updated in NVD database

Technical Details for CVE-2026-49006

Vulnerability Analysis

The vulnerability stems from storing sensitive TLS credentials in an unencrypted form within the device firmware image. An attacker who obtains firmware — through firmware update packages, physical extraction, or network-accessible update mechanisms — can locate and read the credentials without cryptographic effort. Because the credentials govern TLS session establishment, their disclosure undermines the confidentiality guarantees of any traffic secured with those materials.

The scope is limited to confidentiality, with no direct integrity or availability impact recorded. Exploitation requires adjacent network positioning and high attack complexity, reflecting the operational effort needed to access firmware artifacts and apply the recovered credentials against live sessions.

Root Cause

The root cause is the embedding of cryptographic material inside firmware storage that lacks encryption or hardware-backed protection. This design pattern, tracked as [CWE-321] Use of Hard-coded Cryptographic Key, means every device running the vulnerable firmware shares the same recoverable secrets. Rotating credentials on a per-device basis is not possible without a firmware redesign that introduces per-unit key provisioning or secure storage.

Attack Vector

An attacker on an adjacent network first acquires the firmware image, then performs static analysis to extract the TLS credentials. With the credentials in hand, the attacker can attempt to decrypt captured TLS traffic, impersonate the device to backend services, or intercept sessions where the shared keys are used for authentication. Successful exploitation depends on capturing relevant TLS sessions and matching them to the extracted keying material.

No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-49006

Indicators of Compromise

Unauthorized downloads or copies of device firmware images from update servers or file shares
TLS sessions originating from unexpected hosts that present certificates or keys matching the affected device
Anomalous management-plane traffic to the affected device from adjacent network segments

Detection Strategies

Inspect TLS handshakes on management networks for reuse of device certificates or public keys across multiple source addresses
Monitor for firmware retrieval activity from unauthenticated or unexpected clients
Correlate device authentication logs with network telemetry to identify session hijacking or impersonation attempts

Monitoring Recommendations

Capture and retain packet metadata for management interfaces to support post-incident TLS session analysis
Alert on repeated failed or unusual TLS negotiations against backend services that trust the device credentials
Track firmware version inventory and flag devices that have not received the vendor-supplied fix

How to Mitigate CVE-2026-49006

Immediate Actions Required

Apply the firmware update referenced in the ZTE Security Bulletin as soon as it is available for the deployed model
Restrict adjacent network access to the affected devices using segmentation and access control lists
Rotate any backend credentials, certificates, or trust anchors that were shared with the affected devices

Patch Information

Refer to the ZTE Security Bulletin for the fixed firmware versions and installation guidance. The vendor advisory is the authoritative source for patch identifiers and applicability per model.

Workarounds

Isolate affected devices on dedicated VLANs and limit reachability to required management hosts only
Terminate TLS at a hardened proxy that presents independently provisioned certificates rather than relying on device-embedded credentials
Disable remote firmware retrieval interfaces where operationally feasible until patched firmware is deployed

bash

# Configuration example
# Refer to the vendor advisory for firmware upgrade procedures specific to the affected model