Critical 9.8Known exploited (CISA KEV)Published Mar 28, 2018

CVE-2018-0151A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition…

Updated under an hour ago (2026-10-19 09:30 UTC)

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CISA lists it as known exploited since Mar 3, 2022; federal agencies had to remediate by Mar 17, 2022. Treat that date as your deadline.

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Exploited in the last 30 days

A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges. The vulnerability is due to incorrect bounds checking of certain values in packets that are destined for UDP port 18999 of an affected device. An attacker could exploit this vulnerability by sending malicious packets to an affected device. When the packets are processed, an exploitable buffer overflow condition may occur. A successful exploit could allow the attacker to execute arbitrary code on the affected device with elevated privileges. The attacker could also leverage this vulnerability to cause the device to reload, causing a temporary DoS condition while the device is reloading. The malicious packets must be destined to and processed by an affected device. Traffic transiting a device will not trigger the vulnerability. Cisco Bug IDs: CSCvf73881.

CVSS: 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-119
Known exploited: Added to CISA KEV Mar 3, 2022; federal remediation due Mar 17, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 14.20% (percentile 97)
Assigned by: cisco
NVD analysis: Analyzed
Record last updated: Jan 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cisco ios_xe cisco:ios_xe	16.5.1; all versions	NVD

References

https://ics-cert.us-cert.gov/advisories/ICSA-18-107-03x-refsource-misc, third-party-advisory, us-government-resource
http://www.securityfocus.com/bid/103540vdb-entry, x-refsource-bid, third-party-advisory
http://www.securitytracker.com/id/1040582vdb-entry, x-refsource-sectrack, third-party-advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-qosx-refsource-confirm, mitigation, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0151us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.