CVE-2006-6931

CVE-2006-6931 is a medium-severity vulnerability in Snort 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.

Key facts

Description

Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a "backtracking attack."

Frequently asked questions

What is CVE-2006-6931?
Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a "backtracking attack."
How severe is CVE-2006-6931?
CVE-2006-6931 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2006-6931 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-6931?
CVE-2006-6931 affects Snort. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-6931?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-6931 published?
CVE-2006-6931 was published on 2007-01-16 and last updated on 2026-06-16.

References

Affected products (1)

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