How severe is CVE-2016-6398?

CVE-2016-6398 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2016-6398 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6398?

CVE-2016-6398 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-6398?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-6398 published?

CVE-2016-6398 was published on 2016-09-12 and last updated on 2026-06-17.

CVE-2016-6398

CVE-2016-6398 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Cisco Ios
Published: 2016-09-12
Last modified: 2026-06-17

Description

The PPTP server in Cisco IOS 15.5(3)M does not properly initialize packet buffers, which allows remote attackers to obtain sensitive information from earlier network communication by reading packet data, aka Bug ID CSCvb16274.

Frequently asked questions

What is CVE-2016-6398?: The PPTP server in Cisco IOS 15.5(3)M does not properly initialize packet buffers, which allows remote attackers to obtain sensitive information from earlier network communication by reading packet data, aka Bug ID CSCvb16274.
How severe is CVE-2016-6398?: CVE-2016-6398 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2016-6398 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6398?: CVE-2016-6398 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-6398?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-6398 published?: CVE-2016-6398 was published on 2016-09-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:cisco:ios:15.5\(3\)m:*:*:*:*:*:*:*

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