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CVE-2015-6496

16
FAUCET Score

CVE-2015-6496 describes a denial-of-service vulnerability in conntrackd versions 1.4.2 and earlier, affecting conntrack-tools on Debian and Netfilter systems. The flaw allows remote attackers to crash the system by sending DCCP, SCTP, or ICMPv6 packets due to conntrackd failing to verify that optional kernel modules are loaded. With a CVSS score of 5.0, this vulnerability is of medium severity, requiring no authentication and having low attack complexity, resulting in a partial availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.2CPE matchmatch criteria
cpe:2.3:a:netfilter:conntrack-tools:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.20%
Probability of exploitation in next 30 days
EPSS Percentile
86.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0320 is in the 82nd percentile among its peer group of 23,701 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: conntrack-tools
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 6 (Juno)Fixed in: conntrack-tools
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)Fixed in: conntrack-tools

Vendor Advisories (1)

redhatCVE-2015-6496Moderate

conntrackd crash on unexpected network traffic

Mar 24, 2014

References

bugzilla.netfilter.org / show_bug.cgi
ExploitIssue TrackingThird Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2016-January/174875.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2016-January/174883.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2015-10/msg00015.html
Mailing ListThird Party Advisory
git.netfilter.org / conntrack-tools/commit
PatchVendor AdvisoryURL Repurposed
debian.org / security/2015/dsa-3341
Third Party Advisory
openwall.com / lists/oss-security/2015/08/14/4
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2015/08/18/1
Mailing ListThird Party Advisory