Intel

CVE-2026-20177

Industrial Ethernet Switches: Allocation of Resources Without Limits or Throttling (CVE-2026-20177)

mediumEPSS 0.5%

Affected

  • Cisco/Industrial Ethernet Switches range_unparsed *..1000 Series <1.9.6

Description

A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to&nbsp;cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against management plane flooding attacks. An attacker could exploit this vulnerability by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the CPU of the device to increase, resulting in a denial of service (DoS) condition on the device manager web GUI, SSH, or API. Data traffic through the device is not affected.

Source: NVD (NIST)cvelistv5cisco_csafBSI CSAFBSI WID Portal

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

CiscoIndustrial Ethernet Switches
1000 Series <1.9.6

Metrics

XIEM Effective CVSS
5.3
Source: nvd-v3
EPSS percentile
41.8 %
High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status
—
Show all metrics
Severity
medium
Priority score
66.55
Exploit maturity
no public PoC known
CVSS v3
5.3
EPSS score
0.5 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-08-19 16:16 UTC
CWE
CWE-770

Weakness classes (CWE)

  • CWE-770Base

    Allocation of Resources Without Limits or Throttling

    The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. New CVE Received2026-08-19 17:18 UTC· psirt@cisco.com
    • Affected: Cisco Industrial Ethernet Switches
    • Description: A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to&nbsp;cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against management plane flooding attacks. An attacker could exploit this vulnerability by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the CPU of the device to increase, resulting in a denial of service (DoS) condition on the device manager web GUI, SSH, or API. Data traffic through the device is not affected.
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
    • CWE: CWE-770

Linked advisories