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CVE-2015-6496

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules...

5.0 MediumFix available

CVE-2015-6496 is a medium vulnerability (CVSS 5.0) in Netfilter Conntrack-tools, published August 19, 2015. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.20%, the 88th percentile. Fixed in conntrack 1:0.9.14-2+deb6u1.

What does this mean?
Severity
5.0 MediumCVSS 2.0, NVD
Exploit chance
3.20%EPSS, 88th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
1:0.9.14-2+deb6u1conntrack +15 more

Description

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.

Exploit likelihood

3.20%Up 1.8 points since Feb 4, 2022
90%50%10%1%

Affected products

Affected packages

Affected packages
PackageAffectedFixed
conntrack
Debian:6.0
before 1:0.9.14-2+deb6u1, plus listed versions
1:0.9.14-2
1:0.9.14-2+deb6u1
conntrack
Debian:7
before 1:1.2.1-1+deb7u1, plus listed versions
1:1.2.1-1
1:1.2.1-1+deb7u1
conntrack
Debian:8
before 1:1.4.2-2+deb8u1, plus listed versions
1:1.4.2-2
1:1.4.2-2+deb8u1
conntrack-tools
Mageia:4
before 1.4.2-2.1.mga4
1.4.2-2.1.mga4
conntrack-tools
Mageia:5
before 1.4.2-6.1.mga5
1.4.2-6.1.mga5
conntrack-tools
SUSE:Linux Enterprise High Availability Extension 12
before 1.4.2-5.2
1.4.2-5.2
libnetfilter_cthelper
SUSE:Linux Enterprise High Availability Extension 12
before 1.0.0-7.1
1.0.0-7.1
libnetfilter_cttimeout
SUSE:Linux Enterprise High Availability Extension 12
before 1.0.0-9.1
1.0.0-9.1
libnetfilter_cthelper
SUSE:Linux Enterprise Software Development Kit 12
before 1.0.0-7.1
1.0.0-7.1
libnetfilter_cttimeout
SUSE:Linux Enterprise Software Development Kit 12
before 1.0.0-9.1
1.0.0-9.1
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Affected packages
PackageAffectedFixed
conntrack-tools
SUSE:Cloud Compute Node for SUSE Linux Enterprise 12 5
before 1.4.2-5.2
1.4.2-5.2
libnetfilter_cthelper
SUSE:Cloud Compute Node for SUSE Linux Enterprise 12 5
before 1.0.0-7.1
1.0.0-7.1
libnetfilter_cttimeout
SUSE:Cloud Compute Node for SUSE Linux Enterprise 12 5
before 1.0.0-9.1
1.0.0-9.1
conntrack-tools
SUSE:Linux Enterprise High Availability Extension 11 SP3
before 1.0.0-0.9.1
1.0.0-0.9.1
conntrack-tools
SUSE:Linux Enterprise High Availability Extension 11 SP4
before 1.0.0-0.9.1
1.0.0-0.9.1
conntrack-tools
openSUSE:Tumbleweed
before 1.4.4-1.3
1.4.4-1.3

What each source reports

NVD Score used5.0

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.

Record
CVE-2015-6496
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-17
Updated
2026-11-02
CVE ListNo score

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.

Record
CVE-2015-6496
Updated
2026-11-02
EUVDEUVD-2015-6437No score

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.

Record
EUVD-2015-6437
Updated
2026-11-03
GitHub AdvisoriesGHSA-v3f5-57x9-2pvxNo score

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules...

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows remote attackers to cause a denial of service (crash) via a (1) DCCP, (2) SCTP, or (3) ICMPv6 packet.

Record
GHSA-v3f5-57x9-2pvx
Updated
2026-11-02
OSVMGASA-2015-0363No score

Updated conntrack-tools packages fix CVE-2015-6496

Updated conntrack-tools packages fix security vulnerability:

It was discovered that in certain configurations, if the relevant conntrack kernel module is not loaded, conntrackd will crash when handling DCCP, SCTP or ICMPv6 packets (CVE-2015-6496).

Record
MGASA-2015-0363
Updated
2026-11-02
OSVopenSUSE-SU-2024:10430-1No score

conntrack-tools-1.4.4-1.3 on GA media

These are all security issues fixed in the conntrack-tools-1.4.4-1.3 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10430-1
Updated
2026-11-02
OSVSUSE-SU-2015:1545-1No score

Security update for conntrack-tools

Fix a possible crash if conntrackd sees DCCP, SCTP and ICMPv6 traffic and the corresponding kernel modules that track this traffic are not available. (bsc#942149, CVE-2015-6496)

Record
SUSE-SU-2015:1545-1
Updated
2026-11-02
OSVSUSE-SU-2015:1683-1No score

Security update for conntrack-tools

Fix a possible crash if conntrackd sees DCCP, SCTP and ICMPv6 traffic and the corresponding kernel modules that track this traffic are not available. (bsc#942149, CVE-2015-6496)

Record
SUSE-SU-2015:1683-1
Updated
2026-11-02

History

History
RecordedChangedSources
facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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