CVE-2006-6931
MEDIUM · CVSS 5.0EPSS 2.4%EU EUVD
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."
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P- EPSS score
- 2.4% (84th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2006-6914)
- Published
- January 16, 2007
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2006-6914 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- snort / snort
References
- http://lists.immunitysec.com/pipermail/dailydave/2007-January/003954.html
- http://secunia.com/advisories/23716
- http://secunia.com/advisories/24164
- http://secunia.com/advisories/24338
- http://security.gentoo.org/glsa/glsa-200702-03.xml
- http://securitytracker.com/id?1017508
- http://www.acsac.org/2006/abstracts/54.html
- http://www.acsac.org/2006/advance_program.html
- http://www.acsac.org/2006/papers/54.pdf(Vendor Advisory)
- http://www.cs.wisc.edu/~smithr/pubs/acsac2006.pdf(Vendor Advisory)
- http://www.cs.wisc.edu/~smithr/pubs/randy_smith_acsac2006.zip
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:051
- http://www.osvdb.org/32096
- http://www.securityfocus.com/bid/21991
- http://www.snort.org/pub-bin/snortnews.cgi
- https://exchange.xforce.ibmcloud.com/vulnerabilities/31430
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain