{"id":"CVE-2020-2883","published":"2020-04-15T14:15:33Z","modified":"2026-06-17T03:13:10Z","title":"Oracle WebLogic Server Unspecified Vulnerability","vendor":"Oracle","product":"WebLogic Server","tier":"core","eol":null,"description":{"text":"Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via IIOP, T3 to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).","provenance":"source","from":"NVD"},"summary":{"text":"An unspecified flaw in the Core component of Oracle WebLogic Server, part of Oracle Fusion Middleware, affects supported versions 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. An unauthenticated attacker with network access via the IIOP or T3 protocols can easily exploit it to take over the server, requiring no privileges and no user interaction.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:09:36Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.94582,"percentile":0.99854,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2025-01-07","dueDate":"2025-01-28","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","notes":"https://www.oracle.com/security-alerts/cpuapr2020.html ; https://nvd.nist.gov/vuln/detail/CVE-2020-2883","provenance":"source"},"vulncheckKev":{"dateAdded":"2020-04-30","exploitedFirstSeen":"2020-04-30","ransomware":false,"evidence":[{"url":"https://blogs.oracle.com/security/post/customers-should-apply-the-april-2020-critical-patch-update-without-delay","date":"2020-04-30"},{"url":"https://cisa.gov/news-events/alerts/2020/05/01/unpatched-oracle-weblogic-servers-vulnerable-cve-2020-2883","date":"2020-05-01"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2025-01-07"},{"url":"https://cyble.com/resources/research-reports/global-cybersecurity-report/","date":"2025-12-11"},{"url":"https://www.loginsoft.com/reports/annually/vulnerability-intelligence-report-2025","date":"2026-01-20"}],"evidenceTotal":5,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[],"references":[{"url":"http://packetstormsecurity.com/files/157950/WebLogic-Server-Deserialization-Remote-Code-Execution.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://www.oracle.com/security-alerts/cpuapr2020.html","tags":["Vendor Advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-504/","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-570/","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/157950/WebLogic-Server-Deserialization-Remote-Code-Execution.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://www.oracle.com/security-alerts/cpuapr2020.html","tags":["Vendor Advisory"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-504/","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-20-570/","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-2883","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve","ai-mapping"],"basisDetail":"CTID attack_to_cve (Phase 1); claude-haiku-5-5: Unauthenticated network exploitation of public-facing server","mappingType":"uncategorized","evidence":[{"from":"description","quote":"unauthenticated attacker with network access via IIOP, T3 to compromise Oracle WebLogic Server","start":231,"end":325}],"confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"server-side bug exploitable without user interaction; client-execution technique does not fit"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Server takeover implies arbitrary command execution","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server","start":327,"end":416}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-22676","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-22676","exploited":true,"exploitedSince":"2025-01-07","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":7,"skipped":0,"earliest":"2020-05-10","earliestUrl":"https://github.com/Y4er/CVE-2020-2883","repos":[{"name":"Y4er/WebLogic-Shiro-shell","url":"https://github.com/Y4er/WebLogic-Shiro-shell","stars":529,"created":"2020-08-19"},{"name":"Y4er/CVE-2020-2883","url":"https://github.com/Y4er/CVE-2020-2883","stars":176,"created":"2020-05-10"},{"name":"MagicZer0/Weblogic_CVE-2020-2883_POC","url":"https://github.com/MagicZer0/Weblogic_CVE-2020-2883_POC","stars":15,"created":"2020-05-13"},{"name":"Al1ex/CVE-2020-2883","url":"https://github.com/Al1ex/CVE-2020-2883","stars":5,"created":"2020-11-26"},{"name":"FancyDoesSecurity/CVE-2020-2883","url":"https://github.com/FancyDoesSecurity/CVE-2020-2883","stars":2,"created":"2020-10-14"}]},"metasploit":[{"name":"WebLogic Server Deserialization RCE BadAttributeValueExpException ExtComp","module":"exploit/multi/misc/weblogic_deserialize_badattr_extcomp","type":"exploit","disclosureDate":"2020-04-30","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/misc/weblogic_deserialize_badattr_extcomp.rb"}],"nuclei":[{"id":"CVE-2020-2883","name":"Oracle WebLogic Server - Remote Code Execution","severity":"critical","path":"javascript/cves/2020/CVE-2020-2883.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2020/CVE-2020-2883.yaml"}],"first":{"date":"2020-04-30","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/misc/weblogic_deserialize_badattr_extcomp.rb"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/157950/WebLogic-Server-Deserialization-Remote-Code-Execution.html"],"flow":[{"stage":"primary","techniques":["T1059"],"provenance":"ai"},{"stage":"related","techniques":["T1190"],"provenance":"source"},{"stage":"related","techniques":["T1203"],"provenance":"source","lowConfidence":true}],"timeline":[{"date":"2020-04-15","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-2883","provenance":"source"},{"date":"2020-04-30","kind":"exploit-public","label":"First public exploit: Metasploit; later: PoC-in-GitHub 2020-05-10","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/misc/weblogic_deserialize_badattr_extcomp.rb","provenance":"source"},{"date":"2020-04-30","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://blogs.oracle.com/security/post/customers-should-apply-the-april-2020-critical-patch-update-without-delay","provenance":"source"},{"date":"2025-01-07","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2025-01-07","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-22676","provenance":"source"}],"speed":{"daysToPublicExploit":15,"firstExploitFrom":"Metasploit","daysToKev":1728},"priority":{"score":69.8,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 2373 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.97,"detail":"percentile 0.9985"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD exploit link; 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