CVE-2017-6663

Cisco — Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability

Cisco · Denial of service · in CISA KEV since 2022-03-03

KEV since 2022 · listed over a yearCISA KEVActively Exploited

EVRS 75 of 100 Urgent

Patch This Cycle

Rank 1,228 of 2,960 tracked

Raised to the floor for a confirmed exploited vulnerability.

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Why it scores 75

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.021.

CISA KEVApplied
RansomwareDid not apply
Vendor exploitationDid not apply
EPSSApplied
Microsoft Exploitability IndexNot applicable
Pre-patch disclosureNo data
KEV recencyDid not apply
CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

No fixed version identified yet

CISA required action

nvd.nist.gov/…/CVE-2017-6663

Affected versions

ios15.2\(3\)e15.2\(3\)e115.2\(3\)e215.2\(3\)e315.2\(3\)e415.2\(3\)e515.2\(3a\)e15.2\(3a\)e115.2\(3m\)e215.2\(3m\)e315.2\(3m\)e615.2\(3m\)e815.2\(4\)e15.2\(4\)e115.2\(4\)e215.2\(4\)e315.2\(5\)e15.2\(5\)e115.2\(5a\)e15.2\(5b\)e15.3\(3\)s15.3\(3\)s115.3\(3\)s1a15.3\(3\)s215.3\(3\)s315.3\(3\)s415.3\(3\)s515.3\(3\)s615.3\(3\)s715.3\(3\)s815.3\(3\)s8a15.3\(3\)s915.3\(3\)s1015.4\(1\)s15.4\(1\)s115.4\(1\)s215.4\(1\)s315.4\(1\)s415.4\(2\)s15.4\(2\)s115.4\(2\)s215.4\(2\)s315.4\(2\)s415.4\(3\)s15.4\(3\)s115.4\(3\)s215.4\(3\)s315.4\(3\)s415.4\(3\)s515.4\(3\)s5a15.4\(3\)s615.4\(3\)s6a15.4\(3\)s6b15.4\(3\)s715.4\(3\)s7a15.4\(3\)s815.5\(1\)s15.5\(1\)s115.5\(1\)s215.5\(1\)s315.5\(1\)s415.5\(2\)s15.5\(2\)s115.5\(2\)s215.5\(2\)s315.5\(2\)s415.5\(3\)s15.5\(3\)s0a15.5\(3\)s115.5\(3\)s1a15.5\(3\)s215.5\(3\)s2a15.5\(3\)s2b15.5\(3\)s315.5\(3\)s3a15.5\(3\)s415.5\(3\)s4a15.5\(3\)s4b15.5\(3\)s4d15.5\(3\)s515.5\(3\)sn15.6\(1\)s15.6\(1\)s115.6\(1\)s1a15.6\(1\)s215.6\(1\)s315.6\(1\)s415.6\(1\)t15.6\(1\)t0a15.6\(1\)t115.6\(1\)t215.6\(2\)s15.6\(2\)s0a15.6\(2\)s115.6\(2\)s215.6\(2\)s315.6\(2\)s415.6\(2\)sn15.6\(2\)sp15.6\(2\)sp115.6\(2\)sp1b15.6\(2\)sp1c15.6\(2\)sp215.6\(2\)sp2a15.6\(2\)sp315.6\(2\)t15.6\(2\)t115.6\(2\)t215.6\(2\)t315.6\(3\)m15.6\(3\)m0a15.6\(3\)m115.6\(3\)m1b15.6\(3\)m215.6\(3\)m2a15.6\(3\)m315.7\(3\)m
ios xe3.7.0e3.7.1e3.7.3e3.8.0e3.8.0ex3.8.1e3.8.2e3.8.3e3.9.0e3.9.1e3.10.4s3.10.8as3.10.8s3.11.3s3.11.4s3.12.0as3.12.0s3.12.1s3.12.2s3.12.3s3.12.4s3.13.0s3.13.1s3.13.2as3.13.2s3.13.4s3.13.5as3.13.5s3.13.6as3.13.6s3.13.7as3.13.8s3.14.0s3.14.1s3.14.2s3.14.3s3.14.4s3.15.0s3.15.1s3.15.2s3.15.3s3.15.4s3.16.0s3.16.1as3.16.2as3.16.2s3.16.3as3.16.3s3.16.4as3.16.4ds3.16.4s3.16.6s3.17.0s3.17.1as3.17.1s3.17.3s3.17.4s3.18.0as3.18.0s3.18.0sp3.18.1bsp3.18.1s3.18.1sp3.18.2asp3.18.2s3.18.2sp3.18.3s3.18.3sp16.6.1

Remediation

Apply updates per vendor instructions.

Evidence

Each value with its source

Measure	Value	Source
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is.	6.5	NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs.	0.021 (81.7th pctl)	FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild.	Confirmed	CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it.	Unknown or none	CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it.	2022-03-24 · KEV since 2022 · listed over a year	CISA KEV
Public exploit moduleA module existing is not the same as active exploitation.	None known	Metasploit
EUVD cross-referenceENISA's record: CVSS 6.5 (v3.1), assigned by cisco.	Listed	ENISA EUVD

Description

NVD

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.

What CISA says to do

nvd.nist.gov/…/CVE-2017-6663