Cisco IOS and IOS XE Software Plug and Play Agent Memory Leak Vulnerability

published 2018-10-05 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-7255

cvss: 8.6; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

A vulnerability in the Cisco Network Plug and Play agent, also referred to as the Cisco Open Plug-n-Play agent, of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak on an affected device. The vulnerability is due to insufficient input validation by the affected software. An attacker could exploit this vulnerability by sending invalid data to the Cisco Network Plug and Play agent on an affected device. A successful exploit could allow the attacker to cause a memory leak on the affected device, which could cause the device to reload.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-19-094-02 updated 2019-04-04 cvss 6.8

Rockwell Automation Stratix 5400/5410/5700 and ArmorStratix 5700

Rockwell Automation Allen-Bradley ArmorStratix 5700 < 15.2(6)E2a Rockwell Automation Allen-Bradley Stratix 5400 < 15.2(6)E2a Rockwell Automation Allen-Bradley Stratix 5410 < 15.2(6)E2a Rockwell Automation Allen-Bradley Stratix 5700 < 15.2(6)E2a
affected: mitigation “Rockwell automation recommends users upgrade to FRN 15.2(6)E2a or later” rockwellautomation.custhelp.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago (2024-11-25)

Exploit prediction

1.59% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

Cisco Cisco IOS Software

Classification

Weakness

CWE-400 Uncontrolled Resource Consumption
CWE-401 Missing Release of Memory after Effective Lifetime

Technology feeds

Cisco IOS rss critical rss

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-pnp-memleak
vendor-advisory
ics-cert.us-cert.gov /advisories/ICSA-19-094-02
third-party-advisory, us-government-resource

Sources

CVE List CVE-2018-15377
NVD CVE-2018-15377

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary