Ruijie RG-ES205GC Local Firmware Upgrade httpupg.cgi buffer overflow
Affects Ruijie RG-ES Series switches RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP and RG-ES210GS-P through the httpupg.cgi firmware upgrade handler. No fix is listed in the checked facts.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 21/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The affected software is the Local Firmware Upgrade interface (httpupg.cgi) in certain Ruijie RG-ES series network switches. A flaw in this component can be triggered remotely to cause a buffer overflow, which may allow an attacker to disrupt the device or potentially run code on it.
Read the original description
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.
What to do
Workaround: The checked facts give no workaround. Limiting access to the switch's web management interface to trusted hosts would reduce exposure to the httpupg.cgi upgrade handler until a fix is available.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- 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
Evidence 5
- Advisory
- Advisory
- Advisory
- Advisory
- Exploit
Corrections
None so far.
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Questions about CVE-2026-120241
What does this mean?
A buffer overflow in the httpupg.cgi local firmware upgrade handler of Ruijie RG-ES Series switches can be triggered without authentication, causing a denial of service.Source: github.com
Am I affected, and how do I check?
The checked facts list the RG-ES205GC, RG-ES206GC-P, RG-ES208GC, RG-ES210GC-LP and RG-ES210GS-P, but give no version ranges. To check a device, compare its model with this list and look up its firmware version in the vendor's notice.Source: github.com
What should I do about it?
The checked facts name no fixed firmware version, so no upgrade target can be given. Check the vendor's site for a patched firmware release for your model.Source: github.com
Is it being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What if there's no patch?
The checked facts give no workaround. Limiting access to the switch's web management interface to trusted hosts would reduce exposure to the httpupg.cgi upgrade handler until a fix is available.Source: github.com