ExploitedIn CISA KEV

CVE-2017-6663

Exploitation confirmed. First attested on 2022-03-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2017-08-07

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2017-08-0706:29CVE publishedNVD
2022-03-03Added to the CISA KEV catalogCISA KEV
2022-03-03Listed as exploited by GCVEGCVE
2022-03-03Exploitation first reportedCISA KEV
2025-02-1022:09SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-6663?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6663?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco ios

Branch	Affected	Fixed in	Source
15.2	= 15.2\(3\)e	no fix published	NVD
15.2	= 15.2\(3\)e1	no fix published	NVD
15.2	= 15.2\(3\)e2	no fix published	NVD
15.2	= 15.2\(3\)e3	no fix published	NVD
15.2	= 15.2\(3\)e4	no fix published	NVD
15.2	= 15.2\(3\)e5	no fix published	NVD
15.2	= 15.2\(3a\)e	no fix published	NVD
15.2	= 15.2\(3a\)e1	no fix published	NVD
15.2	= 15.2\(3m\)e2	no fix published	NVD
15.2	= 15.2\(3m\)e3	no fix published	NVD
15.2	= 15.2\(3m\)e6	no fix published	NVD
15.2	= 15.2\(3m\)e8	no fix published	NVD

Cisco ios xe

Branch	Affected	Fixed in	Source
3.7	= 3.7.0e	no fix published	NVD
3.7	= 3.7.1e	no fix published	NVD
3.7	= 3.7.3e	no fix published	NVD
3.8	= 3.8.0e	no fix published	NVD
3.8	= 3.8.0ex	no fix published	NVD
3.8	= 3.8.1e	no fix published	NVD
3.8	= 3.8.2e	no fix published	NVD
3.8	= 3.8.3e	no fix published	NVD
3.9	= 3.9.0e	no fix published	NVD
3.9	= 3.9.1e	no fix published	NVD
3.10	= 3.10.4s	no fix published	NVD
3.10	= 3.10.8as	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-03-24

Advisories and patches

tools.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

CISA Known Exploited Vulnerability

Date Added: 2022-03-03
Patch Due Date: 2022-03-24
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-03-03
GCVEexploitation2022-03-03
CISA-ADPSSVC decisionactive2025-02-10
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.16.52025-02-04
NVDCVSS 3.16.5read 2026-10-23
NVDCVSS 2.06.1read 2026-10-23
FIRST EPSSEPSS score2.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-08-07
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-6663?

Is CVE-2017-6663 actively exploited?

Yes. CVE-2017-6663 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-03-24.

What is the CVSS score for CVE-2017-6663?

CVE-2017-6663 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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