EUVD-2026-25258
GHSA-7gf4-qc4w-pmvq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Arbitrary OS command execution on embedded router firmware yields full device compromise; C:H/I:H/A:H appropriate despite NVD's lower C:L/I:L/A:N assignment.
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 recHour parameter to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated remote command injection in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allows network-adjacent or internet-facing attackers to execute arbitrary OS commands on the router by supplying shell metacharacters in the recHour parameter of the /cgi-bin/cstecgi.cgi endpoint. A publicly available proof-of-concept exploit exists on GitHub, and SSVC flags this as automatable with no authentication barrier, making mass exploitation of exposed devices feasible. No vendor patch has been identified at time of analysis; no CISA KEV listing exists, but the combination of unauthenticated network access and available POC represents a credible near-term risk.
Technical ContextAI
The ToToLink A3300R is a consumer-grade router running embedded Linux firmware. Its web management interface is implemented via a CGI binary (/cgi-bin/cstecgi.cgi), a common pattern in low-cost router firmware where HTTP parameters are passed directly to shell command strings with insufficient sanitization. The recHour parameter - likely used for scheduling or time-based configuration - is processed without stripping or escaping shell metacharacters (e.g., semicolons, backticks, pipes), constituting a CWE-77 (Improper Neutralization of Special Elements used in a Command) vulnerability. This root cause class allows attacker-controlled input to break out of the intended command context and execute arbitrary OS-level commands, typically as root on embedded Linux firmware. CPE data from NVD is listed as n/a:n/a, indicating incomplete product enumeration; the specific affected version is confirmed only by the CVE description (v17.0.0cu.557_B20221024).
RemediationAI
No vendor-released patch has been identified at time of analysis; no ToToLink security advisory was found in the provided references. As an immediate compensating control, administrators should restrict network access to the router's web management interface - specifically blocking external access to the CGI endpoint /cgi-bin/cstecgi.cgi - using upstream firewall rules or by disabling WAN-side HTTP/HTTPS management (a common router setting), which removes the attack surface for remote exploitation but does not eliminate the vulnerability for LAN-side attackers. If the management interface must remain accessible, restrict it to known trusted source IP addresses only. Disabling the web-based management interface entirely (if alternative management via serial console or SSH is available) is the most effective compensating control, though this may impact operational manageability. Monitor the ToToLink vendor site and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-31168 for firmware updates. The GitHub POC at https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-rechour-cmd-injection provides technical detail useful for evaluating whether a future patch addresses the root cause.
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Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
Leaving vuln.today