---
title: "CVE-2026-120241: Ruijie RG-ES Series - Buffer Overflow"
description: "Ruijie RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP, and RG-ES210GS-P ESW_1.0(1)B1P48 contain a buffer overflow caused by manipulation of an unknown function in httpupg.cgi Local Firmware Upgrade Interface, letting remote attackers execute arbitrary code, exploit requires remote access."
url: https://panop.io/threat-heartbeat/CVE-2026-120241/
---

# CVE-2026-120241 Ruijie RG-ES Series - Buffer Overflow

Ruijie RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP, and RG-ES210GS-P ESW\_1.0(1)B1P48 contain a buffer overflow caused by manipulation of an unknown function in httpupg.cgi Local Firmware Upgrade Interface, letting remote attackers execute arbitrary code, exploit requires remote access.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.62% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-120241)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

1 November 2026

Updated

3 November 2026

Weakness

[CWE-119](https://cwe.mitre.org/data/definitions/119.html)

## Vendor fix

Update to the latest available version or patch from the vendor.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-120241](https://nvd.nist.gov/vuln/detail/CVE-2026-120241)
- [https://vuldb.com/vuln/429600](https://vuldb.com/vuln/429600)
- [https://vuldb.com/vuln/429600/cti](https://vuldb.com/vuln/429600/cti)
- [https://github.com/byseeker/Ruijie-RG-ES-Series-Switches\_PreAuth\_Boundary\_Overflow\_DoS](https://github.com/byseeker/Ruijie-RG-ES-Series-Switches_PreAuth_Boundary_Overflow_DoS)
- [https://vuldb.com/cve/CVE-2026-120241](https://vuldb.com/cve/CVE-2026-120241)
- [https://vuldb.com/submit/1016041](https://vuldb.com/submit/1016041)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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