# CVE-2026-101077: Netcore NR289-GE authentication bypass in boa web server

Source: https://junglewise.ai/threats/cve-2026-101077-a-flaw-has-been-found-in-netcore-nr289-ge-1-4-5102-this-impacts  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-101077 · Severity: critical · CVSS 10 · Published 2026-09-28

Netcore NR289-GE routers run a web-based management interface (boa) that handles firmware and configuration uploads without requiring authentication. An attacker can send specially crafted requests to write arbitrary files to temporary staging locations, potentially allowing firmware corruption, denial of service, or configuration takeover including web admin credentials. The vulnerability is remotely exploitable with no user interaction required.

Technologies: [Netcore NR289-GE](https://junglewise.ai/threats/technologies/nr289-ge). Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-101077 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101077 being exploited in the wild.

**How severe is CVE-2026-101077?** Critical severity, with a CVSS score of 10, published 28 September 2026.

**Which products and versions are affected?** Netcore NR289-GE 1.4.5102.

**Is there a fix for CVE-2026-101077?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101077 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-101077?** Check whether you run Netcore NR289-GE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The boa HTTP handler in the NR289-GE firmware (v1.4.5102) lacks authentication checks in the process_request function when handling POST requests to paths containing "update", "upgrade", or "para_recover" keywords. An attacker can write arbitrary content to /tmp/boa_temp.update or /tmp/boa_temp.para without credentials, exploiting a .ico whitelist bypass. The written files are consumed by downstream firmware-upgrade and config-restore functions, enabling arbitrary configuration injection or firmware replacement (limited by RSA signature validation on the upgrade path).

## Affected products

- Netcore NR289-GE 1.4.5102

## Timeline

- 2026-09-28: disclosed
- 2026-09-28: exploited: Exploit published on GitHub

## References

- [https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/netcore_NR289-GE_V1.4.5102%2C2018.06.1418_44%20Router/Netcore_NR289-GE_unauth_file_write.md](https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/netcore_NR289-GE_V1.4.5102%2C2018.06.1418_44%20Router/Netcore_NR289-GE_unauth_file_write.md)
- [https://vuldb.com/cve/CVE-2026-101077](https://vuldb.com/cve/CVE-2026-101077)

## Related threats

- [Netcore NR289-GE OS command injection in NTP handler](https://junglewise.ai/threats/cve-2026-101076-a-vulnerability-was-detected-in-netcore-nr289-ge-1-4-5102-this)
- [Netcore NR289-GE OS command injection in location_time.cgi](https://junglewise.ai/threats/cve-2026-101075-a-security-vulnerability-has-been-detected-in-netcore-nr289-ge-1)
- [Netcore NR289-GE stack buffer overflow in boa](https://junglewise.ai/threats/cve-2026-101074-a-weakness-has-been-identified-in-netcore-nr289-ge-1-4-5102-the)
- [Netcore NR289-GE authentication bypass in CGI dispatcher](https://junglewise.ai/threats/cve-2026-101073-a-security-flaw-has-been-discovered-in-netcore-nr289-ge-1-4-5102)
- [Netcore NR289-GE OS command injection in CGI handler](https://junglewise.ai/threats/cve-2026-101072-a-vulnerability-was-identified-in-netcore-nr289-ge-1-4-5102-this)