8.8

CVE-2025-66168: apache software foundation apache activemq Integer Overflow or Wraparound

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2025-66168DEBIAN-CVE-2025-66168CGA-25rr-2jq3-3cxh
Published 04-03-2026Last modified 10-04-2026
Open JSON

Vulnerability summary

CVE-2025-66168 is a high (CVSS 8.8) Integer Overflow or Wraparound vulnerability in apache software foundation apache activemq. EPSS estimates a 0.79% chance of exploitation in the next 30 days, higher than 55.5% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.79%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-Q463-QQ6H-M3VJ

Timeline

  1. 04-03-2026
    PublishedVulnerability first disclosed.
  2. 10-04-2026
    Last modifiedVulnerability information updated.

Description

WARNING: Users of 6.x should upgrade to 6.2.4 or later as the fix was missed in previous 6.x releases. See the  following for more details: https://activemq.apache.org/security-advisories.data/CVE-2026-40046-announcement.txt https://www.cve.org/CVERecord?id=CVE-2026-40046 Original Report: Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes the broker susceptible to unexpected behavior when interacting with non-compliant clients. This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes. The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted. This issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0 Users are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.79%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

+0.01 pp

From 0.78% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.79%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard4 products
  • apache-activemq-6.1All versions (No fix recorded)
  • apache-activemq-fips-6.1All versions (No fix recorded)
  • geoserver-2.27-community< 2.27.5-r2
  • geoserver-2.28-community< 2.28.2-r3
Apache software foundation3 products
Org.apache.activemq3 products
  • activemq-all< 5.19.2 | ≥ 6.0.0, < 6.1.9 | ≥ 6.2.0, < 6.2.1
  • activemq-mqtt< 5.19.2 | ≥ 6.0.0, < 6.1.9 | ≥ 6.2.0, < 6.2.1
  • apache-activemq< 5.19.2 | ≥ 6.0.0, < 6.1.9 | ≥ 6.2.0, < 6.2.1
Apache1 product
  • activemq< 5.19.2 | ≥ 6.0.0, ≤ 6.1.8 | 6.2.0
Debian1 product
  • activemqAll versions (No fix recorded)
Ubuntu1 product
  • activemqAll versions (No fix recorded)

6 vendors · 13 products

References

11 links
Show all 11 references