CVE-2008-1804: preprocessors/spp_frag3.c in Sourcefire Snort before 2.8.1 does not properly identify packet fragments that ha

Q: How do I fix CVE-2008-1804?

snort: upgrade to newer than 2.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2008-1804 being exploited?

CVE-2008-1804 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2008-1804 affect?

CVE-2008-1804 affects snort. Severity is medium (CVSS 6.8). preprocessors/spp_frag3.c in Sourcefire Snort before 2.8.1 does not properly identify packet fragments that have dissimilar TTL values, which allows remote attackers to bypass detection rules by using a different TTL for each fragment.

Q: How urgent is CVE-2008-1804?

Priority 45/100. No elevated risk signals yet.

This month

MEDIUM 6.8UPGRADE

CVE-2008-1804 is a medium-severity flaw (CVSS 6.8) affecting snort. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

preprocessors/spp_frag3.c in Sourcefire Snort before 2.8.1 does not properly identify packet fragments that have dissimilar TTL values, which allows remote attackers to bypass detection rules by using a different TTL for each fragment.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Published	2008-05-22
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: snort

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2008-05-22 13:09 UTCPublished CVE record published
2026-06-16 22:52 UTCUpdated Record last modified

snort snort UPGRADE

Affected: <= 2.8.0

Fixed in: newer than 2.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy snort || rpm -q snort || snort --version

2. UPGRADE to newer than 2.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade snort

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade snort

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2008-1804?

snort: upgrade to newer than 2.8.0. Exact commands for each OS are on this page.

Is CVE-2008-1804 being exploited?

CVE-2008-1804 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2008-1804 affect?

CVE-2008-1804 affects snort. Severity is medium (CVSS 6.8). preprocessors/spp_frag3.c in Sourcefire Snort before 2.8.1 does not properly identify packet fragments that have dissimilar TTL values, which allows remote attackers to bypass detection rules by using a different TTL for each fragment.

How urgent is CVE-2008-1804?

Priority 45/100. No elevated risk signals yet.

Software pages

Suricata and Snort vulnerabilities

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References

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