{"id":"CVE-2013-0422","kind":"vulnerability","aliases":["CVE-2013-0422"],"related":[],"title":"Oracle Java Runtime Environment (JRE): Oracle JRE Remote Code Execution Vulnerability","description":"Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using the public getMBeanInstantiator method in the JmxMBeanServer class to obtain a reference to a private MBeanInstantiator object, then retrieving arbitrary Class references using the findClass method, and (2) using the Reflection API with recursion in a way that bypasses a security check by the java.lang.invoke.MethodHandles.Lookup.checkSecurityManager method due to the inability of the sun.reflect.Reflection.getCallerClass method to skip frames related to the new reflection API, as exploited in the wild in January 2013, as demonstrated by Blackhole and Nuclear Pack, and a different vulnerability than CVE-2012-4681 and CVE-2012-3174. NOTE: some parties have mapped the recursive Reflection API issue to CVE-2012-3174, but CVE-2012-3174 is for a different vulnerability whose details are not public as of 20130114.  CVE-2013-0422 covers both the JMX/MBean and Reflection API issues.  NOTE: it was originally reported that Java 6 was also vulnerable, but the reporter has retracted this claim, stating that Java 6 is not exploitable because the relevant code is called in a way that does not bypass security checks.  NOTE: as of 20130114, a reliable third party has claimed that the findClass/MBeanInstantiator vector was not fixed in Oracle Java 7 Update 11.  If there is still a vulnerable condition, then a separate CVE identifier might be created for the unfixed issue.","summary":"Oracle Java Runtime Environment has a flaw in how it restricts the permissions of Java applets. An attacker can use it to run commands on a vulnerable machine.","severity":"critical","cvss":10.0,"epss":0.97024,"exploited":true,"exploited_at":"2022-05-25T00:00:00+00:00","products":[{"name":"Oracle Java Runtime Environment (JRE)","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["applets","desktop","exploited","java","oracle-jre","ransomware","runtime","windows"],"not_affected_if":["java-applets-disabled","no-java-installed"],"how_to_check":null,"fix":"Apply the Oracle Java update per vendor instructions, as CISA requires; the sources do not name a fixed version.","status":"open","published_at":"2013-01-10T21:55:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:15:36+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-23T21:15:36Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Oracle Java update per vendor instructions, as CISA requires; the sources do not name a fixed version.","reach":"internet","impact":"high","summary":"Oracle Java Runtime Environment has a flaw in how it restricts the permissions of Java applets. An attacker can use it to run commands on a vulnerable machine.","category":"runtime","who_cares":["java","oracle-jre","applets","windows","desktop"],"confidence":0.7,"needs_auth":"no","worst_case":"attacker runs commands on the machine via a malicious applet","analyst_note":"Confirm the affected and fixed Java versions and the applet-enablement conditions from Oracle's advisory for CVE-2013-0422 and the CISA KEV entry.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-java-installed","java-applets-disabled"],"user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000456,"input_tokens":2845,"output_tokens":343,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-0422':14A,17A,203C '-2012':164C,168C,182C,186C '-2013':13A,16A,202C '-3174':169C,183C,187C '-4681':165C '1':78C '11':69C,274C '2':107C '2013':150C '20130114':200C,255C '6':219C,233C '7':66C,272C 'allow':70C 'also':221C 'api':111C,142C,178C,210C 'applet':23B,48B 'arbitrari':75C,99C 'attack':50B,72C 'blackhol':154C 'bypass':118C,249C 'call':242C 'check':121C,251C 'claim':229C,261C 'class':87C,100C 'code':9A,76C,240C 'command':56B 'condit':281C 'cover':204C 'creat':289C 'cve':12A,15A,163C,167C,181C,185C,201C,285C 'demonstr':152C 'desktop':24B 'detail':194C 'differ':160C,191C 'due':126C 'environ':4A,36B 'environment':21A 'execut':10A,74C 'exploit':25B,144C,236C 'findclass':104C 'findclass/mbeaninstantiator':264C 'fix':268C 'flaw':39B 'frame':136C 'getmbeaninstanti':82C 'identifi':286C 'inabl':129C 'issu':179C,211C,293C 'januari':149C 'java':2A,19A,26B,34B,47B,65C,218C,232C,271C 'java.lang.invoke.methodhandles.lookup.checksecuritymanager':124C 'jmx/mbean':207C 'jmxmbeanserv':86C 'jre':5A,7A,22A,29B 'machin':60B 'map':174C 'mbeaninstanti':95C 'method':83C,105C,125C,133C 'might':287C 'multipl':61C 'new':140C 'note':170C,212C,252C 'nuclear':156C 'object':96C 'obtain':89C 'oracl':1A,6A,28B,33B,64C,270C 'oracle':18A 'oracle-jr':27B 'origin':215C 'pack':157C 'parti':172C,259C 'permiss':45B 'privat':94C 'public':81C,197C 'ransomwar':30B 'recurs':113C,176C 'refer':91C,101C 'reflect':110C,141C,177C,209C 'relat':137C 'relev':239C 'reliabl':257C 'remot':8A,71C 'report':216C,225C 'restrict':43B 'retract':227C 'retriev':98C 'run':55B 'runtim':3A,31B,35B 'runtime':20A 'secur':120C,250C 'separ':284C 'skip':135C 'state':230C 'still':278C 'sun.reflect.reflection.getcallerclass':132C 'third':258C 'unfix':292C 'updat':68C,273C 'use':52B,79C,102C,108C 'vector':265C 'vulner':11A,59B,62C,161C,192C,222C,280C 'way':116C,245C 'whose':193C 'wild':147C 'window':32B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2013-01-10T21:55:00+00:00","kev":{"dateAdded":"2022-05-25","dueDate":"2022-06-15","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2013-0422","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2013-0422","severity":null,"published_at":"2022-05-25T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T10:39:06+00:00","note":null},{"source":"epss","external_id":"CVE-2013-0422","url":"https://api.first.org/data/v1/epss?cve=CVE-2013-0422","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:45+00:00","fetched_at":"2026-10-23T19:13:45+00:00","note":null},{"source":"nvd","external_id":"CVE-2013-0422","url":"https://nvd.nist.gov/vuln/detail/CVE-2013-0422","severity":null,"published_at":"2013-01-10T21:55:00+00:00","modified_at":"2026-06-16T23:49:24+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}