No exploitation reported

CVE-2017-3859

No exploitation reported by the sources we read.

Published2017-03-22
WeaknessCWE-134

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 DHCP code for the Zero Touch Provisioning feature of Cisco ASR 920 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to a format string vulnerability when processing a crafted DHCP packet for Zero Touch Provisioning. An attacker could exploit this vulnerability by sending a specially crafted DHCP packet to an affected device. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects Cisco ASR 920 Series Aggregation Services Routers that are running an affected release of Cisco IOS XE Software (3.13 through 3.18) and are listening on the DHCP server port. By default, the devices do not listen on the DHCP server port. Cisco Bug IDs: CSCuy56385.

Timeline

dates in UTC

2017-03-2219:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2017-3859?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-3859?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 xeversion to verify

Branch	Affected	Fixed in	Source
3.13	= 3.13.4s	no fix published	NVD
3.13	= 3.13.5as	no fix published	NVD
3.13	= 3.13.5s	no fix published	NVD
3.13	= 3.13.6as	no fix published	NVD
3.13	= 3.13.6s	no fix published	NVD
3.14	= 3.14.3s	no fix published	NVD
3.14	= 3.14.4s	no fix published	NVD
3.15	= 3.15.2s	no fix published	NVD
3.15	= 3.15.3s	no fix published	NVD
3.15	= 3.15.4s	no fix published	NVD
3.16	= 3.16.0cs	no fix published	NVD
3.16	= 3.16.0s	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 3.07.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
CNAweakness (CWE)CWE-134read 2026-10-23
NVDweakness (CWE)CWE-134read 2026-10-23
FIRST EPSSEPSS score2.5 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-03-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-3859?

Is CVE-2017-3859 actively exploited?

Active exploitation of CVE-2017-3859 has not been confirmed. Its EPSS score was 2.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-3859?

CVE-2017-3859 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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