PHP2Shell : See if you’re affected with a free external attack surface scan. Click Here > 

Back
New CVE Detected

CVE-2026-101077 – Unauthenticated Arbitrary File Write / RCE Chain – Netcore NR289-GE 1.4.5102

Be the first to know when new zero-days emerge:

Subscribe to Email Alerts
Subscribe to RSS Feed

Summary

CVE-2026-101077 is a missing-authentication (CWE-306) vulnerability in the process_request function of the boa_temp handler in the embedded boa web server used by the Netcore NR289-GE router, firmware version 1.4.5102. The flaw allows an unauthenticated remote attacker to write arbitrary content to fixed staging files on the device, which feed into the firmware upgrade and configuration-restore processes. The vulnerability has a maximum CVSS v3.1 base score of 10.0 (Critical) and a public exploit is available.

Technical details

  • Root cause: the router’s boa binary inspects the URL path of incoming POST requests for the substrings update/upgrade or para_recover. If matched, it opens a fixed file (/tmp/boa_temp.update or /tmp/boa_temp.para) and streams the raw POST body into it, with no authentication, size limit, or content validation.
  • Trigger conditions: any POST request whose path contains one of the matched substrings is processed by this logic, regardless of session state or credentials. Public PoC combines this with a separate .ico extension whitelist flaw to reach the handler without any authentication at all.
  • Attack vector: Network — a single unauthenticated HTTP POST request (e.g., POST /x.ico/firmware_upgrade) is sufficient; the HTTP response (typically 404) does not reflect the fact that the file has already been written server-side.
  • Impact: /tmp/boa_temp.update is later moved to /tmp/upgrade and consumed by the device’s AP/firmware upgrade flow, allowing an attacker to corrupt or plant content in the upgrade channel (denial of service; further impact is bounded by an RSA signature check). /tmp/boa_temp.para is consumed by the configuration-restore flow, which only validates a device-model string in the header, allowing a crafted configuration blob (including web credentials) to be staged for restoration onto the device.

Affected software

  • Netcore NR289-GE router firmware version 1.4.5102 (build 2018.06.14)

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor patch is currently available — Netcore was contacted about this disclosure and did not respond. Contact Netcore support directly to request a firmware update addressing this issue.
  • If no patch: Restrict management/web-interface access on the router to trusted internal networks only, and disable remote/WAN administration. Block or firewall unauthenticated POST requests to the device’s web server where feasible, and monitor for unexpected writes/changes tied to firmware-upgrade or configuration-restore activity. Given the lack of vendor response, organizations should evaluate replacing affected devices in security-sensitive deployments.

References

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report

How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report
Close

Subscribe to Threat Center RSS

Copy/paste the link below into your preferred RSS reader or follow these instructions to subscribe to Slack alerts.

Open RSS feedSlack setup instructions

Close

Get Real-Time CVE Alerts to Your Email

Be the first to know when new zero-days emerge