CVE-2026-120241

Ruijie RG-ES205GC Local Firmware Upgrade httpupg.cgi buffer overflow

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.

Affected

Ruijie · RG-ES205GC · RG-ES206GC-P · RG-ES208GC · RG-ES210GC-LP · RG-ES210GS-P

CVSS v4.0 VULDB

7.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULDB

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

CVSS v2.0 VULDB

7.8 HIGHAV:N/AC:L/Au:N/C:N/I:N/A:C

EPSS

0.62% chance of exploitation in the next 30 days, 50th percentile

Published

2026-11-01

Proof-of-concept exploits (1)

• byseeker/Ruijie-RG-ES-Series-Switches_PreAuth_Boundary_Overflow_DoSRepo stars 0★ · pushed 2026-10-06 · snapshot
  1 file

  CVE_RG-ES_PreAuth_Boundary_Overflow_DoS_EN.md

CVE references

• https://vuldb.com/cve/CVE-2026-120241ADVISORY
• https://vuldb.com/submit/1016041ADVISORY
• https://vuldb.com/vuln/429600REFERENCE
• https://vuldb.com/vuln/429600/ctiREFERENCE

References

• CVE Record
• NVD entry

Related

• CVE-2026-120242