Plattform
linux
Komponente
totolink-a8000r
Behoben in
5.9.1
CVE-2026-5676 describes an authentication bypass vulnerability affecting the Totolink A8000R router. This flaw allows attackers to bypass authentication controls and potentially gain unauthorized access to the device's configuration and functionality. The vulnerability impacts routers running versions 5.9c.681B20180413–5.9c.681B20180413. A fix is expected from the vendor, but currently, mitigation strategies are required.
Successful exploitation of CVE-2026-5676 allows an attacker to bypass authentication on the Totolink A8000R router. This could lead to complete control over the device, enabling them to modify network settings, intercept traffic, and potentially pivot to other systems on the network. Given the router's role as a gateway, a compromised device can expose the entire internal network to external threats. The availability of a public exploit significantly increases the likelihood of widespread exploitation, particularly targeting home and small business networks.
This vulnerability is publicly known with a readily available exploit, indicating a high probability of exploitation. It was disclosed on 2026-04-06. While not yet listed on CISA KEV, the public availability of the exploit warrants close monitoring. Active campaigns targeting vulnerable routers are possible, given the ease of exploitation.
Small and medium-sized businesses (SMBs) and home users relying on the Totolink A8000R router are at significant risk. Shared hosting environments using this router model are particularly vulnerable, as a compromise could impact multiple tenants. Users with default router configurations or those who have not updated their firmware in a long time are also at increased risk.
• linux / server:
journalctl -u totolink -g 'cstecgi.cgi'• generic web:
curl -I http://<router_ip>/cgi-bin/cstecgi.cgi?langType=malicious_value• generic web:
grep -A 10 'langType=' /var/log/apache2/access.logdisclosure
Exploit-Status
EPSS
0.09% (26% Perzentil)
CISA SSVC
CVSS-Vektor
Due to the lack of a provided fixed version, immediate mitigation is crucial. Implement strict firewall rules to restrict access to /cgi-bin/cstecgi.cgi from untrusted sources. Consider temporarily disabling remote management features if not essential. Monitor router logs for suspicious activity, particularly requests to /cgi-bin/cstecgi.cgi with unusual parameters. While a WAF might offer some protection, it's unlikely to be effective against this specific bypass without custom rules. Regularly check the Totolink website for firmware updates and apply them as soon as they become available. After applying any mitigation steps, verify functionality by attempting to access the router’s web interface from a known safe IP address.
Aktualisieren Sie die Firmware des Totolink A8000R Routers auf eine korrigierte Version. Besuchen Sie die offizielle Totolink-Website, um die neueste Firmware-Version und die Update-Anweisungen zu erhalten. Diese Schwachstelle ermöglicht die Remote-Codeausführung aufgrund fehlender Authentifizierung bei der Sprachkonfiguration, daher ist es entscheidend, das Update anzuwenden, um das Risiko zu mindern.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2026-5676 is a HIGH severity vulnerability in the Totolink A8000R router allowing attackers to bypass authentication by manipulating the 'langType' parameter, potentially gaining full control of the device.
You are affected if your Totolink A8000R router is running version 5.9c.681B20180413–5.9c.681B20180413 and has not been upgraded to a patched firmware.
The recommended fix is to upgrade to a patched firmware version. Unfortunately, a fixed version is not provided. Implement firewall rules and monitor logs as temporary workarounds.
Yes, a public exploit exists, indicating a high probability of active exploitation and increasing the urgency to mitigate the vulnerability.
Refer to the NVD and CISA databases for details on CVE-2026-5676. Check the Totolink website for firmware updates and security advisories.
Lade deine Abhängigkeitsdatei hoch und erfahre sofort, ob dich diese und andere CVEs treffen.