# CVE-2026-120241: Ruijie RG-ES switch series buffer overflow in httpupg.cgi

Source: https://junglewise.ai/threats/cve-2026-120241-a-vulnerability-was-identified-in-ruijie-rg-es205gc-rg-es206gc-p  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-01. Updated: 2026-11-01  
License: CC BY 4.0 with a link back

CVE-2026-120241 · Severity: high · CVSS 7.5 · Published 2026-11-01

A network switch used in enterprise environments contains a buffer overflow vulnerability in its firmware upgrade interface that allows unauthenticated remote attackers to cause a denial of service. An attacker can crash the switch or potentially execute code without needing valid credentials, affecting network availability.

Vendors: [Ruijie](https://junglewise.ai/threats/vendors/ruijie).

## Quick answers

**Is CVE-2026-120241 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120241 being exploited in the wild.

**How severe is CVE-2026-120241?** High severity, with a CVSS score of 7.5, published 1 November 2026.

**Which products and versions are affected?** Ruijie RG-ES205GC ESW_1.0(1)B1P48; Ruijie RG-ES206GC-P ESW_1.0(1)B1P48; Ruijie RG-ES208GC ESW_1.0(1)B1P48; Ruijie RG-ES210GC-LP ESW_1.0(1)B1P48; and 1 more.

**Is there a fix for CVE-2026-120241?** 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-2026-120241 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-120241?** Check whether you run Ruijie RG-ES205GC, Ruijie RG-ES206GC-P, Ruijie RG-ES208GC or one of the others listed 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

A boundary overflow vulnerability exists in the httpupg.cgi component of the Local Firmware Upgrade Interface in affected Ruijie switch models. The vulnerability is remotely exploitable without authentication and leads to denial of service; a publicly available proof-of-concept demonstrating the crash exists. The vendor was notified early but has not responded with a patch.

## Affected products

- Ruijie RG-ES205GC ESW_1.0(1)B1P48
- Ruijie RG-ES206GC-P ESW_1.0(1)B1P48
- Ruijie RG-ES208GC ESW_1.0(1)B1P48
- Ruijie RG-ES210GC-LP ESW_1.0(1)B1P48
- Ruijie RG-ES210GS-P ESW_1.0(1)B1P48

## Timeline

- 2026-11-01: disclosed

## References

- [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)