EUVD-2026-25260
GHSA-359c-pmx2-3g2p
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Arbitrary OS command injection on root-privileged router firmware yields full device control, making C:H/I:H/A:H appropriate despite the published C:L/I:L/A:N metrics.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionCVE.org
An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the url parameter to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated OS command injection in ToToLink A3300R router firmware v17.0.0cu.557_B20221024 exposes the device to remote code execution via the /cgi-bin/cstecgi.cgi web management endpoint. The published CVSS score of 6.5 with C:L/I:L/A:N impact metrics is inconsistent with the arbitrary command execution primitive described - router firmware CGI handlers typically execute with root-equivalent privileges, making full device compromise the realistic outcome. A public proof-of-concept repository exists on GitHub, and SSVC classifies the vulnerability as automatable, though no confirmed active exploitation appears in CISA KEV at time of analysis.
Technical ContextAI
The affected product is the ToToLink A3300R wireless router, a budget SOHO device, running firmware version v17.0.0cu.557_B20221024. The vulnerable component is the CGI-based web management interface, specifically the /cgi-bin/cstecgi.cgi request handler, which accepts a url parameter and incorporates it into an OS-level operation without sanitization. CWE-77 (Improper Neutralization of Special Elements used in an OS Command) identifies the root cause class: shell metacharacters embedded in the url value are passed directly to a system command interpreter, enabling injection of arbitrary instructions. On embedded Linux-based router firmware, CGI processes commonly run with root or near-root privileges, meaning successful injection yields control over all device functions including persistent configuration, credential storage, and traffic routing. The NVD CPE entry is listed as n/a, indicating the product has not yet been formally catalogued in the National Vulnerability Database product dictionary, which may delay automated patch management tooling from identifying exposure.
RemediationAI
No vendor-released patch has been identified at time of analysis - no patched firmware version appears in any available reference or advisory. As an immediate compensating control, disable remote (WAN-side) management access on the A3300R via the admin panel to restrict the /cgi-bin/cstecgi.cgi endpoint to LAN-only access; this reduces the attack surface to adversaries who already have a LAN foothold, significantly raising the exploitation bar. Additionally, apply perimeter firewall rules blocking inbound HTTP and HTTPS traffic destined for the router's management ports (typically 80, 443, or 8080 on the WAN interface) to prevent internet-based exploitation. If LAN-only restriction is not operationally feasible, consider placing the device behind a management VLAN with strict ACLs. For the long term, replacing the A3300R with a device from a vendor that actively maintains firmware security updates is strongly recommended, as budget SOHO routers from this vendor category frequently receive no post-disclosure patches. Monitor the ToToLink official firmware portal and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-31171 for patch availability.
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Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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