How severe is CVE-2015-6289?

CVE-2015-6289 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-2015-6289 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6289?

CVE-2015-6289 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-6289?

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-2015-6289 published?

CVE-2015-6289 was published on 2016-06-23 and last updated on 2026-06-17.

CVE-2015-6289

CVE-2015-6289 is a high-severity vulnerability in Cisco Ios 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-399.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2016-06-23
Last modified: 2026-06-17

Description

Cisco IOS 15.5(3)M on Integrated Services Router (ISR) 800, 819, and 829 devices allows remote attackers to cause a denial of service (memory consumption) via crafted TCP packets on the SSH port, aka Bug ID CSCuu13476.

Frequently asked questions

What is CVE-2015-6289?: Cisco IOS 15.5(3)M on Integrated Services Router (ISR) 800, 819, and 829 devices allows remote attackers to cause a denial of service (memory consumption) via crafted TCP packets on the SSH port, aka Bug ID CSCuu13476.
How severe is CVE-2015-6289?: CVE-2015-6289 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-2015-6289 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6289?: CVE-2015-6289 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-6289?: 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-2015-6289 published?: CVE-2015-6289 was published on 2016-06-23 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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