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Fencer Intel
medium 5.0

CVE-2015-6496 json

conntrackd in conntrack-tools 1.4.2 and earlier does not ensure that the optional kernel modules are loaded before using them, which allows…

published 11y ago modified 4mo ago also EUVD-2015-6437

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • conntrack-tools SLE High Availability Extension 12, Cloud Compute Node for SUSE Linux Enterprise 12 5 1.4.2-5.2
  • libnetfilter_cthelper SLE Software Development Kit 12, SLE High Availability Extension 12, Cloud Compute Node for SUSE Linux Enterprise 12 5 1.0.0-7.1
  • libnetfilter_cttimeout SLE Software Development Kit 12, SLE High Availability Extension 12, Cloud Compute Node for SUSE Linux Enterprise 12 5 1.0.0-9.1
  • conntrack-tools SLE High Availability Extension 11 SP4, SLE High Availability Extension 11 SP3 1.0.0-0.9.1

suse advisories SUSE-SU-2015:1545-1SUSE-SU-2015:1683-1

  • conntrack-tools openSUSE Tumbleweed 1.4.4-1.3

opensuse advisories openSUSE-SU-2024:10430-1

Is CVE-2015-6496 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-6496 updated cvss 5.0

conntrackd crash on unexpected network traffic

  • Red Hat Enterprise Linux 7 conntrack-tools
    affected: no fix available
  • Red Hat Enterprise Linux OpenStack Platform 6 (Juno) conntrack-tools Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) conntrack-tools
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.20% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugzilla.netfilter.org http://bugzilla.netfilter.org/show_bug.cgi?id=910 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.