CVE-2026-19846: Stack-based Buffer Overflow in TOTOLINK A800R
A vulnerability was identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument url leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might be used.
AI Analysis
Technical Summary
This vulnerability in TOTOLINK A800R firmware 4.1.2cu.5137_B20200730 involves a stack-based buffer overflow in the setUrlFilterRules function of /cgi-bin/cstecgi.cgi in firewall.so. An attacker can remotely exploit this by sending crafted input to the url parameter, causing memory corruption. The vulnerability has a CVSS 4.0 score of 8.7, indicating high impact with network attack vector, low complexity, no privileges or user interaction required, but high impact on confidentiality, integrity, and availability. Public exploit code exists, increasing the risk of exploitation. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation can lead to remote code execution or denial of service on the affected device, compromising confidentiality, integrity, and availability. The vulnerability requires no user interaction and can be triggered remotely, making it a significant risk for affected devices.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict access to the device's management interface from untrusted networks and monitor for any suspicious activity targeting the vulnerable function.
CVE-2026-19846: Stack-based Buffer Overflow in TOTOLINK A800R
Description
A vulnerability was identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument url leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might be used.
CVSS v4.0
Score 8.7high
Affected software
TOTOLINK
A800R
pkg:github/panda666-888/vuls/totolink/a800rRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in TOTOLINK A800R firmware 4.1.2cu.5137_B20200730 involves a stack-based buffer overflow in the setUrlFilterRules function of /cgi-bin/cstecgi.cgi in firewall.so. An attacker can remotely exploit this by sending crafted input to the url parameter, causing memory corruption. The vulnerability has a CVSS 4.0 score of 8.7, indicating high impact with network attack vector, low complexity, no privileges or user interaction required, but high impact on confidentiality, integrity, and availability. Public exploit code exists, increasing the risk of exploitation. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation can lead to remote code execution or denial of service on the affected device, compromising confidentiality, integrity, and availability. The vulnerability requires no user interaction and can be triggered remotely, making it a significant risk for affected devices.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, restrict access to the device's management interface from untrusted networks and monitor for any suspicious activity targeting the vulnerable function.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-14T08:04:38.024Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7f5043bf8831d53976b1df
Added to database: 08/14/2026, 17:28:35 UTC
Last enriched: 08/14/2026, 17:41:07 UTC
Last updated: 09/29/2026, 01:47:40 UTC
Views: 68
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