{"id":"CVE-2023-26464","published":"2023-03-10T13:38:16Z","modified":"2025-02-13T16:44:55Z","title":"Apache Log4j 1.x (EOL) allows DoS in Chainsaw and SocketAppender","vendor":"Apache Software Foundation","product":"Apache Log4j","tier":"core","eol":null,"affectedVersions":[{"vendor":"Apache Software Foundation","product":"Apache Log4j","versions":[">= 1.0.4, < 2"]}],"description":{"text":"** UNSUPPORTED WHEN ASSIGNED **\n\nWhen using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted (ie, deeply nested) \nhashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve Denial of Service when the object is deserialized.\n\nThis issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x.\n\nNOTE: This vulnerability only affects products that are no longer supported by the maintainer.","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.01905,"percentile":0.79662,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2025-12-08","exploitedFirstSeen":"2025-12-08","ransomware":false,"evidence":[{"url":"https://www.f5.com/labs/articles/shellshock-makes-a-comeback-and-rondodox-changes-tactics","date":"2025-12-08"}],"evidenceTotal":1,"provenance":"source"},"exploited":true,"otx":{"pulseCount":2,"pulses":[{"name":"ACTUALIZACION | Oracle Critical Patch Update Advisory - April 2026","url":"https://otx.alienvault.com/pulse/6a04aeed763730d81a39cece","created":"2026-05-13"},{"name":"ACTUALIZACION | ||Oracle Critical Patch Update Advisory - April 2025","url":"https://otx.alienvault.com/pulse/6807e1c45dd52410facbed8f","created":"2025-04-22"}],"provenance":"machine"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t","tags":["vendor-advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20230505-0008/","tags":[]}],"techniques":[],"reports":[],"affected":[{"ecosystem":"Maven","package":"org.apache.logging.log4j:log4j-core","vulnerableRanges":[">=1.0.4, <2.0"],"patched":["2.0"],"from":["GHSA-vp98-w2p3-mv35"],"provenance":"source"},{"ecosystem":"Maven","package":"log4j:log4j","vulnerableRanges":[">=1.0.4, <2.0"],"patched":["2.0"],"from":["GHSA-vp98-w2p3-mv35"],"provenance":"source"}],"advisories":[{"id":"GHSA-vp98-w2p3-mv35","url":"https://github.com/advisories/GHSA-vp98-w2p3-mv35","severity":"HIGH","ecosystem":"Maven","package":"org.apache.logging.log4j:log4j-core","vulnerableRanges":[">=1.0.4, <2.0"],"patched":["2.0"],"provenance":"source","from":"GHSA"},{"id":"GHSA-vp98-w2p3-mv35","url":"https://github.com/advisories/GHSA-vp98-w2p3-mv35","severity":"HIGH","ecosystem":"Maven","package":"log4j:log4j","vulnerableRanges":[">=1.0.4, <2.0"],"patched":["2.0"],"provenance":"source","from":"GHSA"}],"euvd":{"id":"EUVD-2023-1115","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-1115","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2023-03-10","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2023-26464","provenance":"source"},{"date":"2025-12-08","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.f5.com/labs/articles/shellshock-makes-a-comeback-and-rondodox-changes-tactics","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":62.3,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 325 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":15.93,"detail":"percentile 0.7966"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":1.08,"detail":"2 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}