How severe is CVE-2017-6663?

CVE-2017-6663 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-6663 being actively exploited?

Yes. CVE-2017-6663 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2017-6663?

CVE-2017-6663 primarily affects Cisco Ios. In total, 186 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-6663?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2017-6663 have an EU (EUVD) identifier?

Yes. CVE-2017-6663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-15717. It is also flagged as exploited in the EUVD (since 2022-03-03).

When was CVE-2017-6663 published?

CVE-2017-6663 was published on 2017-08-07 and last updated on 2026-06-17.

CVE-2017-6663

CVE-2017-6663 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 6.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-03).

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.1
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-03)
EU (EUVD) id: EUVD-2017-15717
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-03)
Affected product: Cisco Ios
Published: 2017-08-07
Last modified: 2026-06-17

Description

A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known Affected Releases: Denali-16.2.1 Denali-16.3.1.

Frequently asked questions

What is CVE-2017-6663?: A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known Affected Releases: Denali-16.2.1 Denali-16.3.1.
How severe is CVE-2017-6663?: CVE-2017-6663 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-6663 being actively exploited?: Yes. CVE-2017-6663 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2017-6663?: CVE-2017-6663 primarily affects Cisco Ios. In total, 186 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-6663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2017-6663 have an EU (EUVD) identifier?: Yes. CVE-2017-6663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-15717. It is also flagged as exploited in the EUVD (since 2022-03-03).
When was CVE-2017-6663 published?: CVE-2017-6663 was published on 2017-08-07 and last updated on 2026-06-17.

References

Affected products (186)

cpe:2.3:o:cisco:ios:15.2\(3\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3\)e5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3a\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3a\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3m\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3m\)e3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3m\)e6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(3m\)e8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(4\)e3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5\)e1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5a\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(5b\)e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s8a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s9:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.3\(3\)s10:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(1\)s4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(2\)s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(2\)s1:*:*:*:*:*:*:*

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