CVE-2017-6663
MediumExploitedPublic exploitA 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.
Published Aug 7, 2017 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2017-6663 is a medium-severity vulnerability (CVSS 6.5 v3.1) affecting IOS (Cisco), IOS Xe (Cisco), Cisco IOS and IOS XE.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022. Public exploit code is available.
- EPSS estimates a 2.1% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
2.1%
Higher than 81.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| Industry KEV feed | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| CIRCL KEV | Mar 3, 2022 | Mar 24, 2022 | Not reported |
| ENISA EUVD | Mar 3, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
187 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IOSCisco | 15.2\(3a\)e, 15.2\(3a\)e1, 15.2\(3\)e, 15.2\(3\)e1, 15.2\(3\)e2, 15.2\(3\)e3, 15.2\(3\)e4, 15.2\(3\)e5 | n/a |
| IOS XeCisco | 16.6.1, 3.10.4s, 3.10.8as, 3.10.8s, 3.11.3s, 3.11.4s, 3.12.0as, 3.12.0s | n/a |
| Cisco IOS and IOS XE | >= Cisco IOS and IOS XE | n/a |
Timeline
Publicly disclosed
Aug 7, 2017
Added to CISA KEV
Mar 3, 2022
Added to Industry KEV feed
Mar 3, 2022
Added to CIRCL KEV
Mar 3, 2022
Added to ENISA EUVD
Mar 3, 2022
Last updated
Apr 22, 2026
References
FAQ
Common Questions.
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.
Affected: IOS (Cisco) versions 15.2\(3a\)e, 15.2\(3a\)e1, 15.2\(3\)e, 15.2\(3\)e1, 15.2\(3\)e2, 15.2\(3\)e3, 15.2\(3\)e4, 15.2\(3\)e5; IOS Xe (Cisco) versions 16.6.1, 3.10.4s, 3.10.8as, 3.10.8s, 3.11.3s, 3.11.4s, 3.12.0as, 3.12.0s; Cisco IOS and IOS XE versions >= Cisco IOS and IOS XE. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 3, 2022.
Yes. It was added on Mar 3, 2022 with a federal remediation due date of Mar 24, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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