TI-2026-83640 Aliases CVE-2026-120241 GHSA-6j24-g64r-jw54

Buffer overflow in Ruijie RG-ES205GC local firmware upgrade

HIGH 77CWE-119Published 2026-11-01 · Updated 2026-11-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

Ruijie RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP and RG-ES210GS-P are affected from ESW_1.0(1)B1P48. Manipulation of the httpupg.cgi file in the local firmware upgrade interface causes a buffer overflow (CWE-120). A remote attacker can trigger it without privileges or user interaction, and a public exploit is available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

A vulnerability was identified in Ruijie RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP and RG-ES210GS-P ESW_1.0(1)B1P48. Impacted is an unknown function of the file httpupg.cgi of the component Local Firmware Upgrade Interface. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00619 49th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Ruijie	RG-ES205GC	ESW_1.0(1)B1P48	—	No fix listed	CNA
Ruijie	RG-ES206GC-P	ESW_1.0(1)B1P48	—	No fix listed	CNA
Ruijie	RG-ES208GC	ESW_1.0(1)B1P48	—	No fix listed	CNA
Ruijie	RG-ES210GC-LP	ESW_1.0(1)B1P48	—	No fix listed	CNA
Ruijie	RG-ES210GS-P	ESW_1.0(1)B1P48	—	No fix listed	CNA

RG-ES205GC VendorRuijie Affected ESW_1.0(1)B1P48 Fixed in — No fix listed CNA
RG-ES206GC-P VendorRuijie Affected ESW_1.0(1)B1P48 Fixed in — No fix listed CNA
RG-ES208GC VendorRuijie Affected ESW_1.0(1)B1P48 Fixed in — No fix listed CNA
RG-ES210GC-LP VendorRuijie Affected ESW_1.0(1)B1P48 Fixed in — No fix listed CNA
RG-ES210GS-P VendorRuijie Affected ESW_1.0(1)B1P48 Fixed in — No fix listed CNA

CPE names CNA · 5

CPE	Versions	Role	Vendor
cpe:2.3:a:ruijie:rg-es205gc::::::::	—	—	Ruijie
cpe:2.3:a:ruijie:rg-es206gc-p::::::::	—	—	Ruijie
cpe:2.3:a:ruijie:rg-es208gc::::::::	—	—	Ruijie
cpe:2.3:a:ruijie:rg-es210gc-lp::::::::	—	—	Ruijie
cpe:2.3:a:ruijie:rg-es210gs-p::::::::	—	—	Ruijie

cpe:2.3:a:ruijie:rg-es205gc:*:*:*:*:*:*:*:* Versions — — ·Ruijie
cpe:2.3:a:ruijie:rg-es206gc-p:*:*:*:*:*:*:*:* Versions — — ·Ruijie
cpe:2.3:a:ruijie:rg-es208gc:*:*:*:*:*:*:*:* Versions — — ·Ruijie
cpe:2.3:a:ruijie:rg-es210gc-lp:*:*:*:*:*:*:*:* Versions — — ·Ruijie
cpe:2.3:a:ruijie:rg-es210gs-p:*:*:*:*:*:*:*:* Versions — — ·Ruijie

Remediation

The sources list no fixed version for Ruijie RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP or RG-ES210GS-P.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Timeline

2026-11-01 Threatist record created from CVE-2026-120241
2026-11-01 Alias added: GHSA-6j24-g64r-jw54
2026-11-03 Priority changed: MEDIUM → LOW
2026-11-05 CISA SSVC decision points changed
2026-11-05 Priority changed: LOW → HIGH

References

Exploit 1

https://github.com/byseeker/Ruijie-RG-ES-Series-Switches_PreAuth_Boundary_Overflow_DoS

TI-2024-28677 The mqlink.elf is service component in Ruijie RG-EW300N with firmware ReyeeOS 1.300.1422… CVSS 3.1CRITICAL 9.8
TI-2024-16009 Insecure Permissions vulnerability in Ruijie RG-NBS2009G-P RGOS v.10.4(1)P2 Release… CVSS 3.1CRITICAL 9.8
TI-2019-12440 An issue was found on the Ruijie EG-2000 series gateway. CVSS 3.1CRITICAL 9.8
TI-2026-62315 Ruijie RG-EW3000GX user_list_note admin os command injection CVSS 4.0CRITICAL 9.4
TI-2026-62314 Ruijie RG-EW3000GX configChange unifyframe-sgi.elf cc_set os command injection CVSS 4.0CRITICAL 9.4
TI-2023-20169 A command injection vulnerability in RG-EW series home routers and repeaters… CVSS 3.1HIGH 8.8

See all 114 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences