CVE-2026-90680
CriticalCVSS 9.9Summary
A stack-based buffer overflow vulnerability was discovered in D-Link DIR-823G version 1.0.2B05_20181207, in the strcpy function of /HNAP1/SetStaticRouteSettings (HNAP1 component). Manipulating the PAddress/SubnetMask/Gateway arguments triggers the overflow. The attack can be launched remotely.
Risk Assessment
A remote attacker could trigger a stack-based buffer overflow, potentially leading to arbitrary code execution or denial of service on the network edge device.
Recommendation
Update the D-Link DIR-823G firmware to the latest version or restrict access to the HNAP1 interface to trusted networks only.
Other vulnerabilities in D-Link DIR-823G
See all- CVE-2020-25368Critical
A command injection vulnerability was discovered in the HNAP1 protocol on D-Link DIR-823G devices running firmware V1.0.2B05. An attacker can remotely execute arbitrary system commands by sending a crafted login request with shell metacharacters in the PrivateLogin field.
- CVE-2020-25366Critical
A vulnerability in the /cgi-bin/upload_firmware.cgi component of D-Link DIR-823G REVA1 1.02B05 allows attackers to cause a denial of service (DoS) via unspecified vectors.
- CVE-2020-25367Critical
A command injection vulnerability was discovered in the HNAP1 protocol in D-Link DIR-823G devices with firmware V1.0.2B05. An attacker can remotely execute arbitrary web scripts by sending shell metacharacters in the Captcha field during login.
- CVE-2026-15270High
A weakness has been identified in the web interface of D-link DIR-823G router version 1.0.2B05_20181207 in the file /etc/boa/boa.conf. Manipulation of this file can lead to a least privilege violation. The attack can be launched remotely but requires a high level of complexity.
- CVE-2026-11492Medium
A flaw in D-Link DIR-823G 1.0.2B05 in the vsftpd component allows remote violation of the least privilege principle.
- CVE-2025-60675Medium
A command injection vulnerability exists in the D-Link DIR-823G router firmware DIR823G_V1.0.2B05_20181207.bin in the timelycheck and sysconf binaries. The vulnerability occurs because parsed fields from the /tmp/new_qos.rule configuration file are concatenated into command strings and executed via system() without any sanitization.
- CVE-2025-60671Medium
A command injection vulnerability exists in the D-Link DIR-823G router firmware DIR823G_V1.0.2B05_20181207.bin in the timelycheck and sysconf binaries, which process the /var/system/linux_vlan_reinit file. The vulnerability occurs because content read from this file is only partially validated for a prefix and then formatted using vsnprintf() before being executed with system(), allowing an attacker with write access to /var/system/linux_vlan_reinit to execute arbitrary commands on the device.
Original NVD description (English source)
A security flaw has been discovered in D-Link DIR-823G 1.0.2B05_20181207. The impacted element is the function strcpy of the file /HNAP1/SetStaticRouteSettings of the component HNAP1. The manipulation of the argument PAddress/SubnetMask/Gateway results in stack-based buffer overflow. The attack can be launched remotely.