No exploitation reported

CVE-2017-3883

No exploitation reported by the sources we read.

Published2017-10-19
WeaknessCWE-770

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 authentication, authorization, and accounting (AAA) implementation of Cisco Firepower Extensible Operating System (FXOS) and NX-OS System Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability occurs because AAA processes prevent the NX-OS System Manager from receiving keepalive messages when an affected device receives a high rate of login attempts, such as in a brute-force login attack. System memory can run low on the FXOS devices under the same conditions, which could cause the AAA process to unexpectedly restart or cause the device to reload. An attacker could exploit this vulnerability by performing a brute-force login attack against a device that is configured with AAA security services. A successful exploit could allow the attacker to cause the affected device to reload. This vulnerability affects the following Cisco products if they are running Cisco FXOS or NX-OS System Software that is configured for AAA services: Firepower 4100 Series Next-Generation Firewall, Firepower 9300 Security Appliance, Multilayer Director Switches, Nexus 1000V Series Switches, Nexus 1100 Series Cloud Services Platforms, Nexus 2000 Series Switches, Nexus 3000 Series Switches, Nexus 3500 Platform Switches, Nexus 5000 Series Switches, Nexus 5500 Platform Switches, Nexus 5600 Platform Switches, Nexus 6000 Series Switches, Nexus 7000 Series Switches, Nexus 7700 Series Switches, Nexus 9000 Series Switches in NX-OS mode, Nexus 9500 R-Series Line Cards and Fabric Modules, Unified Computing System (UCS) 6100 Series Fabric Interconnects, UCS 6200 Series Fabric Interconnects, UCS 6300 Series Fabric Interconnects. Cisco Bug IDs: CSCuq58760, CSCuq71257, CSCur97432, CSCus05214, CSCux54898, CSCvc33141, CSCvd36971, CSCve03660.

Timeline

dates in UTC

2017-10-1908:29CVE publishedNVD

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-2017-3883?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-3883?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco nx-osversion to verify

Branch	Affected	Fixed in	Source
5.2	= 5.2	no fix published	NVD
6.2	= 6.2	no fix published	NVD
6.3	= 6.3	no fix published	NVD
7.3	= 7.3	no fix published	NVD
8.1	= 8.1	no fix published	NVD
8.2	= 8.2	no fix published	NVD
4.1	≤ 4.1	no fix published	NVD
6.0	≤ 6.0	no fix published	NVD
7.0	= 7.0	no fix published	NVD
7.0	= 7.0\(3\)i3\(1\)	no fix published	NVD
5.2	≤ 5.2	no fix published	NVD
7.1	= 7.1\(0.1\)	no fix published	NVD

Cisco firepower extensible operating systemversion to verify

Branch	Affected	Fixed in	Source
2.3	≤ 2.3	no fix published	NVD

Cisco fxosversion to verify

Branch	Affected	Fixed in	Source
2.3	= 2.3	no fix published	NVD

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

Fix

Advisories and patches

tools.cisco.comVendor Advisory

Detection

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

Sources

NVDCVSS 3.08.6read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-770read 2026-10-23
FIRST EPSSEPSS score4.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Published: 2017-10-19
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-3883?

Is CVE-2017-3883 actively exploited?

Active exploitation of CVE-2017-3883 has not been confirmed. Its EPSS score was 4.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-3883?

CVE-2017-3883 has a CVSS v3 base score of 8.6 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

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