No exploitation reportedFix available

CVE-2004-0816

Q: Is CVE-2004-0816 actively exploited?

Active exploitation of CVE-2004-0816 has not been confirmed. Its EPSS score was 11.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2004-0816?

CVE-2004-0816 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2004-12-23
Fixed in2.6.8
WeaknessCWE-191

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Integer underflow in the firewall logging rules for iptables in Linux before 2.6.8 allows remote attackers to cause a denial of service (application crash) via a malformed IP packet.

Timeline

dates in UTC

2004-12-2305:00CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2004-0816?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2004-0816?format=csv
TAXII collection of exploited CVEs
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Versions per branch

NVD

Linux linux kernel

Branch	Affected	Fixed in	Source
2.6	< 2.6.8	2.6.8	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Linux linux kernel to 2.6.8

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-191read 2026-10-23
FIRST EPSSEPSS score11.5 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2004-12-23
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2004-0816?

Integer underflow in the firewall logging rules for iptables in Linux before 2.6.8 allows remote attackers to cause a denial of service (application crash) via a malformed IP packet.

Is CVE-2004-0816 actively exploited?

Active exploitation of CVE-2004-0816 has not been confirmed. Its EPSS score was 11.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2004-0816?

CVE-2004-0816 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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