How severe is CVE-2017-6658?

CVE-2017-6658 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-6658 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6658?

CVE-2017-6658 affects Cisco Sourcefire Snort. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-6658?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-6658 published?

CVE-2017-6658 was published on 2017-05-16 and last updated on 2026-06-17.

CVE-2017-6658

CVE-2017-6658 is a high-severity vulnerability in Cisco Sourcefire Snort with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Cisco Sourcefire Snort
Published: 2017-05-16
Last modified: 2026-06-17

Description

Cisco Sourcefire Snort 3.0 before build 233 has a Buffer Overread related to use of a decoder array. The size was off by one making it possible to read past the end of the array with an ether type of 0xFFFF. Increasing the array size solves this problem.

Frequently asked questions

What is CVE-2017-6658?: Cisco Sourcefire Snort 3.0 before build 233 has a Buffer Overread related to use of a decoder array. The size was off by one making it possible to read past the end of the array with an ether type of 0xFFFF. Increasing the array size solves this problem.
How severe is CVE-2017-6658?: CVE-2017-6658 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-6658 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6658?: CVE-2017-6658 affects Cisco Sourcefire Snort. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-6658?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-6658 published?: CVE-2017-6658 was published on 2017-05-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cisco:sourcefire_snort:3.0:*:*:*:*:*:*:*

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