How severe is CVE-2011-4905?

CVE-2011-4905 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-4905 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4905?

CVE-2011-4905 primarily affects Apache Activemq. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4905?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4905 published?

CVE-2011-4905 was published on 2012-01-05 and last updated on 2026-06-16.

CVE-2011-4905

CVE-2011-4905 is a medium-severity vulnerability in Apache Activemq with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Apache Activemq
Published: 2012-01-05
Last modified: 2026-06-16

Description

Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and broker crash or hang) by sending many openwire failover:tcp:// connection requests.

Frequently asked questions

What is CVE-2011-4905?: Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and broker crash or hang) by sending many openwire failover:tcp:// connection requests.
How severe is CVE-2011-4905?: CVE-2011-4905 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-4905 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4905?: CVE-2011-4905 primarily affects Apache Activemq. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4905?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4905 published?: CVE-2011-4905 was published on 2012-01-05 and last updated on 2026-06-16.

References

Affected products (32)

cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:1.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:1.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:1.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:1.4:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:1.5:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:2.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:2.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:3.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:3.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:3.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:3.2.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.0:m4:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.0:rc2:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.0.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.0.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:4.1.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.1.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.2.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.3.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.3.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.3.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.4.0:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.4.1:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.4.2:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.4.3:*:*:*:*:*:*:*
cpe:2.3:a:apache:activemq:5.5.0:*:*:*:*:*:*:*

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