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Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-27533\n\ud83d\udd25 CVSS Score: 6.9 (cvssV4_0, 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)\n\ud83d\udd39 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.\n\ud83d\udccf Published: 2025-05-07T08:59:00.249Z\n\ud83d\udccf Modified: 2025-05-07T09:04:12.173Z\n\ud83d\udd17 References:\n1. https://lists.apache.org/thread/8hcm25vf7mchg4zbbhnlx2lc5bs705hg", "creation_timestamp": "2025-05-07T09:23:35.000000Z"}, {"uuid": "5e61e459-de46-48cb-bf7a-92a441c24318", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-27533", "type": "published-proof-of-concept", "source": "https://t.me/GithubRedTeam/36093", "content": "GitHub\u76d1\u63a7\u6d88\u606f\u63d0\u9192\uff01\uff01\uff01 \n\n\u66f4\u65b0\u4e86\uff1aCVE-2025\n\u63cf\u8ff0\uff1aexploit for CVE-2025-27533, a Denial of Service (DoS) vulnerability in Apache ActiveMQ\nURL\uff1ahttps://github.com/absholi7ly/CVE-2025-27533-Exploit-for-Apache-ActiveMQ\n\n\u6807\u7b7e\uff1a#CVE-2025", "creation_timestamp": "2025-05-09T02:47:54.000000Z"}, {"uuid": "a6aedf9d-9c35-43dd-8f00-e5c9d62f6161", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-27533", "type": "seen", "source": "https://t.me/cvedetector/24689", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-27533 - Apache ActiveMQ Memory Allocation with Excessive Size Value Denial of Service\", \n  \"Content\": \"CVE ID : CVE-2025-27533 \nPublished : May 7, 2025, 9:15 a.m. | 1\u00a0hour, 14\u00a0minutes ago \nDescription : 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. \nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"07 May 2025\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "creation_timestamp": "2025-05-07T13:09:05.000000Z"}, {"uuid": "db872fe6-0c03-45f4-b3da-8bda39426c45", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-27533", "type": "seen", "source": "https://t.me/pphm_HackerNews/423", "content": "Hidden Threat in Messaging Software Could Crash Critical Systems\n\nApache ActiveMQ, a widely used open-source message broker, has been identified with a critical vulnerability (CVE-2025-27533) that could be exploited to cause a Denial of Service (DoS).This flaw arises from improper validation of buffer sizes during the unmarshalling of OpenWire commands, potentially allowing attackers to deplete system memory and crash the broker service.\n\n\ud83d\udd17 Read More", "creation_timestamp": "2026-07-22T05:00:06.085654Z"}, {"uuid": "e04c0dfa-2b73-45cf-a343-c181c5b0137e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2025-27533", "type": "seen", "source": "https://t.me/pphm_HackerNews/423", "content": "Hidden Threat in Messaging Software Could Crash Critical Systems\n\nApache ActiveMQ, a widely used open-source message broker, has been identified with a critical vulnerability (CVE-2025-27533) that could be exploited to cause a Denial of Service (DoS).This flaw arises from improper validation of buffer sizes during the unmarshalling of OpenWire commands, potentially allowing attackers to deplete system memory and crash the broker service.\n\n\ud83d\udd17 Read More", "creation_timestamp": "2026-07-23T00:00:23.551534Z"}]}