CVE-2017-6657 json
Cisco Sourcefire Snort 3.0 before build 233 mishandles Ether Type Validation.
published 2017-05-16 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-15711
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 64%
- public exploits
- 0
- none known
Summary
Cisco Sourcefire Snort 3.0 before build 233 mishandles Ether Type Validation. Since valid ether type and IP protocol numbers do not overlap, Snort++ stores all protocol decoders in a single array. That makes it possible to craft packets that have IP protocol numbers in the ether type field which will confuse the Snort++ decoder. For example, an eth:llc:snap:icmp6 packet will cause a crash because there is no ip6 header with which to calculate the icmp6 checksum. Affected decoders include gre, llc, trans_bridge, ciscometadata, linux_sll, and token_ring. The fix adds a check in the packet manager to validate the ether type before indexing the decoder array. An out of range ether type will raise 116:473.
Exploit prediction
1.06% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Affected products
- n/a Snort 3.0 All versions prior to build 233.
References
-
tools.cisco.com
/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515-snort
vendor-advisory
-
securitytracker.com
/id/1038483
vdb-entry
-
blog.snort.org
/2017/05/snort-vulnerabilities-found.html
third-party-advisory
Sources
- CVE List CVE-2017-6657
- NVD CVE-2017-6657
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