{"cve":"CVE-2025-27533","nvd":{"published":"2025-05-07T09:15:18.820","modified":"2026-06-17T09:03:46.173","status":"Modified","description":"Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ.\n\nDuring unmarshalling of OpenWire commands the size value of buffers was not properly validated which could lead to excessive memory allocation and be exploited to cause a denial of service (DoS) by depleting process memory, thereby affecting applications and services that rely on the availability of the ActiveMQ broker when not using mutual TLS connections.\nThis issue affects Apache ActiveMQ: from 6.0.0 before 6.1.6, from 5.18.0 before 5.18.7, from 5.17.0 before 5.17.7, before 5.16.8. ActiveMQ 5.19.0 is not affected.\n\nUsers are recommended to upgrade to version 6.1.6+, 5.19.0+,  5.18.7+, 5.17.7, or 5.16.8 or which fixes the issue.\n\nExisting users may implement mutual TLS to mitigate the risk on affected brokers.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/AU:Y/R:A/V:D/RE:M/U:Red","score":6.9},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-789"],"references":["https://lists.apache.org/thread/8hcm25vf7mchg4zbbhnlx2lc5bs705hg","http://www.openwall.com/lists/oss-security/2025/05/06/1","https://lists.debian.org/debian-lts-announce/2025/06/msg00020.html"],"products":["apache:activemq"],"source":"nvd","synced_at":"2026-10-19T22:01:22.920403922+00:00"},"epss":{"cve":"CVE-2025-27533","score":0.08963,"percentile":0.95256,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-whxr-3p84-rf3c","url":"https://osv.dev/vulnerability/GHSA-whxr-3p84-rf3c","summary":"Apache ActiveMQ: Unchecked buffer length can cause excessive memory allocation","modified":"2026-09-10T03:50:25.005474363Z","packages":[{"ecosystem":"Maven","name":"org.apache.activemq:activemq-openwire-legacy","purl":"pkg:maven/org.apache.activemq/activemq-openwire-legacy","ranges":["<5.16.8"],"fixed":["5.16.8"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-client","purl":"pkg:maven/org.apache.activemq/activemq-client","ranges":["<5.16.8"],"fixed":["5.16.8"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-openwire-legacy","purl":"pkg:maven/org.apache.activemq/activemq-openwire-legacy","ranges":[">=5.17.0 <5.17.7"],"fixed":["5.17.7"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-openwire-legacy","purl":"pkg:maven/org.apache.activemq/activemq-openwire-legacy","ranges":[">=5.18.0 <5.18.7"],"fixed":["5.18.7"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-openwire-legacy","purl":"pkg:maven/org.apache.activemq/activemq-openwire-legacy","ranges":[">=6.0.0 <6.1.6"],"fixed":["6.1.6"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-client","purl":"pkg:maven/org.apache.activemq/activemq-client","ranges":[">=5.17.0 <5.17.7"],"fixed":["5.17.7"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-client","purl":"pkg:maven/org.apache.activemq/activemq-client","ranges":[">=5.18.0 <5.18.7"],"fixed":["5.18.7"]},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-client","purl":"pkg:maven/org.apache.activemq/activemq-client","ranges":[">=6.0.0 <6.1.6"],"fixed":["6.1.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}