TOTOLINK A950RG: Command injection in UploadCustomModule
Summary
A flaw in the UploadCustomModule function of lib/cste_modules/product.so on the TOTOLINK A950RG router allows command injection through the FileMd5 argument. The attack can be launched remotely over the network. A public proof-of-concept exploit has been published, and VulDB reports that the exploit may be used. The router's management interface should therefore never be reachable from the internet.
Affected
- TOTOLINK A950RG, firmware 4.1.2cu.5268_B20221104
- Other firmware versions: Unknown.
Fixed in
Unknown. No vendor advisory or patched firmware has been found.
Workaround
- No vendor workaround is known.
- Disable remote (WAN) management and limit access to the web admin interface to trusted LAN hosts.
- Block inbound access to the device's management ports at the firewall.
Exploitation
- Public proof-of-concept exploit: yes (VulDB: exploit status Proof-of-Concept, access public; CISA SSVC: Exploitation poc, Automatable yes).
- Known exploited in the wild: no evidence found; not listed as known exploited in the sources reviewed.
Our recommendation
- Inventory all TOTOLINK A950RG devices and check whether their management interface is reachable from the internet.
- Restrict or disable remote management and isolate the device from untrusted networks now.
- Check the TOTOLINK support page for a fixed firmware release and apply it if available.
- If no supported fix exists, replace the device.
- Monitor the router for unexpected configuration changes or outbound connections.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Proof-of-concept write-up (GitHub Gist) gist.github.com
- VulDB entry VDB-424943 vuldb.com
- VulDB CVE entry vuldb.com
- VulDB CTI entry vuldb.com
- TOTOLINK website www.totolink.net
- CVE mirror (Strix) www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 00:56.
Original description (NVD)
A flaw has been found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by this issue is the function UploadCustomModule of the file lib/cste_modules/product.so. Executing a manipulation of the argument FileMd5 can lead to command injection. The attack can be launched remotely. The exploit has been published and may be used.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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