How severe is CVE-2015-6496?

CVE-2015-6496 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-6496 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6496?

CVE-2015-6496 primarily affects Netfilter Conntrack-tools. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-6496?

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

When was CVE-2015-6496 published?

CVE-2015-6496 was published on 2015-08-24 and last updated on 2026-06-17.

CVE-2015-6496

CVE-2015-6496 is a medium-severity vulnerability in Netfilter Conntrack-tools 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-17.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-17
Affected product: Netfilter Conntrack-tools
Published: 2015-08-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2015-6496?: 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.
How severe is CVE-2015-6496?: CVE-2015-6496 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-6496 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6496?: CVE-2015-6496 primarily affects Netfilter Conntrack-tools. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-6496?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-6496 published?: CVE-2015-6496 was published on 2015-08-24 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:netfilter:conntrack-tools:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

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