CVE-2025-27533

MEDIUM EPSS 94.4%
Published May 7, 20251y ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published May 7, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ. During 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. This 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. Users 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. Existing users may implement mutual TLS to mitigate the risk on affected brokers.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:D/RE:M/U:Red
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
94.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-789

Affected Products 4

VendorProductVersionRange
apacheactivemq*≥5.16.0  –  <5.16.8
apacheactivemq*≥5.17.0  –  <5.17.7
apacheactivemq*≥5.18.0  –  <5.18.7
apacheactivemq*≥6.0.0  –  <6.1.6

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2025/05/06/1
    Mailing ListThird Party Advisory
  • lists.apache.org https://lists.apache.org/thread/8hcm25vf7mchg4zbbhnlx2lc5bs705hg
    Mailing ListVendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/06/msg00020.html

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.