CVE-2025-20311

Summary

CVECVE-2025-20311
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-24 18:15:34 UTC
Updated2026-09-26 00:10:00 UTC
DescriptionA vulnerability in the handling of certain Ethernet frames in Cisco IOS XE Software for Catalyst 9000 Series Switches could allow an unauthenticated, adjacent attacker to cause an egress port to become blocked and drop all outbound traffic. This vulnerability is due to improper handling of crafted Ethernet frames. An attacker could exploit this vulnerability by sending crafted Ethernet frames through an affected switch. A successful exploit could allow the attacker to cause the egress port to which the crafted frame is forwarded to start dropping all frames, resulting in a denial of service (DoS) condition.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS: 0.002020000 probability, percentile 0.090050000 (date 2026-09-27)

Problem Types: CWE-19 | CWE-19 Data Handling


VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1CNACVSSV3_17.4HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Cisco Catalyst 9200 - All All All
Hardware Cisco Catalyst 9200cx - All All All
Hardware Cisco Catalyst 9200l - All All All
Hardware Cisco Catalyst 9300 - All All All
Hardware Cisco Catalyst 9300-24p-a - All All All
Hardware Cisco Catalyst 9300-24p-e - All All All
Hardware Cisco Catalyst 9300-24s-a - All All All
Hardware Cisco Catalyst 9300-24s-e - All All All
Hardware Cisco Catalyst 9300-24t-a - All All All
Hardware Cisco Catalyst 9300-24t-e - All All All
Hardware Cisco Catalyst 9300-24u-a - All All All
Hardware Cisco Catalyst 9300-24u-e - All All All
Hardware Cisco Catalyst 9300-24ux-a - All All All
Hardware Cisco Catalyst 9300-24ux-e - All All All
Hardware Cisco Catalyst 9300-48p-a - All All All
Hardware Cisco Catalyst 9300-48p-e - All All All
Hardware Cisco Catalyst 9300-48s-a - All All All
Hardware Cisco Catalyst 9300-48s-e - All All All
Hardware Cisco Catalyst 9300-48t-a - All All All
Hardware Cisco Catalyst 9300-48t-e - All All All
Hardware Cisco Catalyst 9300-48u-a - All All All
Hardware Cisco Catalyst 9300-48u-e - All All All
Hardware Cisco Catalyst 9300-48un-a - All All All
Hardware Cisco Catalyst 9300-48un-e - All All All
Hardware Cisco Catalyst 9300-48uxm-a - All All All
Hardware Cisco Catalyst 9300-48uxm-e - All All All
Hardware Cisco Catalyst 9300l - All All All
Hardware Cisco Catalyst 9300l-24p-4g-a - All All All
Hardware Cisco Catalyst 9300l-24p-4g-e - All All All
Hardware Cisco Catalyst 9300l-24p-4x-a - All All All
Hardware Cisco Catalyst 9300l-24p-4x-e - All All All
Hardware Cisco Catalyst 9300l-24t-4g-a - All All All
Hardware Cisco Catalyst 9300l-24t-4g-e - All All All
Hardware Cisco Catalyst 9300l-24t-4x-a - All All All
Hardware Cisco Catalyst 9300l-24t-4x-e - All All All
Hardware Cisco Catalyst 9300l-48p-4g-a - All All All
Hardware Cisco Catalyst 9300l-48p-4g-e - All All All
Hardware Cisco Catalyst 9300l-48p-4x-a - All All All
Hardware Cisco Catalyst 9300l-48p-4x-e - All All All
Hardware Cisco Catalyst 9300l-48t-4g-a - All All All
Hardware Cisco Catalyst 9300l-48t-4g-e - All All All
Hardware Cisco Catalyst 9300l-48t-4x-a - All All All
Hardware Cisco Catalyst 9300l-48t-4x-e - All All All
Hardware Cisco Catalyst 9300lm - All All All
Hardware Cisco Catalyst 9300l Stack - All All All
Hardware Cisco Catalyst 9300x - All All All
Hardware Cisco Catalyst 9400 - All All All
Hardware Cisco Catalyst 9400 Supervisor Engine-1 - All All All
Hardware Cisco Catalyst 9407r - All All All
Hardware Cisco Catalyst 9410r - All All All
Hardware Cisco Catalyst 9500 - All All All
Hardware Cisco Catalyst 9500h - All All All
Hardware Cisco Catalyst 9600 - All All All
Hardware Cisco Catalyst 9600x - All All All
Hardware Cisco Catalyst 9600 Supervisor Engine-1 - All All All
Operating System Cisco Ios Xe 16.10.1 All All All
Operating System Cisco Ios Xe 16.10.1e All All All
Operating System Cisco Ios Xe 16.10.1s All All All
Operating System Cisco Ios Xe 16.11.1 All All All
Operating System Cisco Ios Xe 16.11.1b All All All
Operating System Cisco Ios Xe 16.11.1s All All All
Operating System Cisco Ios Xe 16.12.1 All All All
Operating System Cisco Ios Xe 16.12.14 All All All
Operating System Cisco Ios Xe 16.12.1c All All All
Operating System Cisco Ios Xe 16.12.1s All All All
Operating System Cisco Ios Xe 16.12.2 All All All
Operating System Cisco Ios Xe 16.12.2s All All All
Operating System Cisco Ios Xe 16.12.3 All All All
Operating System Cisco Ios Xe 16.12.3a All All All
Operating System Cisco Ios Xe 16.12.3s All All All
Operating System Cisco Ios Xe 16.12.4 All All All
Operating System Cisco Ios Xe 16.12.4a All All All
Operating System Cisco Ios Xe 16.12.5 All All All
Operating System Cisco Ios Xe 16.12.5b All All All
Operating System Cisco Ios Xe 16.12.6 All All All
Operating System Cisco Ios Xe 16.12.6a All All All
Operating System Cisco Ios Xe 16.12.7 All All All
Operating System Cisco Ios Xe 16.12.8 All All All
Operating System Cisco Ios Xe 16.6.1 All All All
Operating System Cisco Ios Xe 16.6.10 All All All
Operating System Cisco Ios Xe 16.6.2 All All All
Operating System Cisco Ios Xe 16.6.3 All All All
Operating System Cisco Ios Xe 16.6.4 All All All
Operating System Cisco Ios Xe 16.6.4a All All All
Operating System Cisco Ios Xe 16.6.5 All All All
Operating System Cisco Ios Xe 16.6.6 All All All
Operating System Cisco Ios Xe 16.6.7 All All All
Operating System Cisco Ios Xe 16.6.8 All All All
Operating System Cisco Ios Xe 16.6.9 All All All
Operating System Cisco Ios Xe 16.7.1 All All All
Operating System Cisco Ios Xe 16.8.1 All All All
Operating System Cisco Ios Xe 16.8.1a All All All
Operating System Cisco Ios Xe 16.8.1s All All All
Operating System Cisco Ios Xe 16.9.1 All All All
Operating System Cisco Ios Xe 16.9.1s All All All
Operating System Cisco Ios Xe 16.9.2 All All All
Operating System Cisco Ios Xe 16.9.3 All All All
Operating System Cisco Ios Xe 16.9.4 All All All
Operating System Cisco Ios Xe 16.9.5 All All All
Operating System Cisco Ios Xe 16.9.6 All All All
Operating System Cisco Ios Xe 16.9.7 All All All
Operating System Cisco Ios Xe 16.9.8 All All All
Operating System Cisco Ios Xe 17.1.1 All All All
Operating System Cisco Ios Xe 17.1.1s All All All
Operating System Cisco Ios Xe 17.1.1t All All All
Operating System Cisco Ios Xe 17.1.3 All All All
Operating System Cisco Ios Xe 17.10.1 All All All
Operating System Cisco Ios Xe 17.10.1b All All All
Operating System Cisco Ios Xe 17.11.1 All All All
Operating System Cisco Ios Xe 17.11.99sw All All All
Operating System Cisco Ios Xe 17.12.1 All All All
Operating System Cisco Ios Xe 17.12.1z3 All All All
Operating System Cisco Ios Xe 17.12.2 All All All
Operating System Cisco Ios Xe 17.12.3 All All All
Operating System Cisco Ios Xe 17.12.4 All All All
Operating System Cisco Ios Xe 17.13.1 All All All
Operating System Cisco Ios Xe 17.14.1 All All All
Operating System Cisco Ios Xe 17.15.1 All All All
Operating System Cisco Ios Xe 17.15.2 All All All
Operating System Cisco Ios Xe 17.15.2a All All All
Operating System Cisco Ios Xe 17.15.2b All All All
Operating System Cisco Ios Xe 17.16.1 All All All
Operating System Cisco Ios Xe 17.2.1 All All All
Operating System Cisco Ios Xe 17.2.1a All All All
Operating System Cisco Ios Xe 17.3.1 All All All
Operating System Cisco Ios Xe 17.3.2 All All All
Operating System Cisco Ios Xe 17.3.2a All All All
Operating System Cisco Ios Xe 17.3.3 All All All
Operating System Cisco Ios Xe 17.3.4 All All All
Operating System Cisco Ios Xe 17.3.4b All All All
Operating System Cisco Ios Xe 17.3.5 All All All
Operating System Cisco Ios Xe 17.3.6 All All All
Operating System Cisco Ios Xe 17.3.7 All All All
Operating System Cisco Ios Xe 17.3.8 All All All
Operating System Cisco Ios Xe 17.3.8a All All All
Operating System Cisco Ios Xe 17.4.1 All All All
Operating System Cisco Ios Xe 17.5.1 All All All
Operating System Cisco Ios Xe 17.6.1 All All All
Operating System Cisco Ios Xe 17.6.1y All All All
Operating System Cisco Ios Xe 17.6.2 All All All
Operating System Cisco Ios Xe 17.6.3 All All All
Operating System Cisco Ios Xe 17.6.4 All All All
Operating System Cisco Ios Xe 17.6.5 All All All
Operating System Cisco Ios Xe 17.6.5a All All All
Operating System Cisco Ios Xe 17.6.6 All All All
Operating System Cisco Ios Xe 17.6.6a All All All
Operating System Cisco Ios Xe 17.6.7 All All All
Operating System Cisco Ios Xe 17.6.8 All All All
Operating System Cisco Ios Xe 17.7.1 All All All
Operating System Cisco Ios Xe 17.8.1 All All All
Operating System Cisco Ios Xe 17.9.1 All All All
Operating System Cisco Ios Xe 17.9.2 All All All
Operating System Cisco Ios Xe 17.9.3 All All All
Operating System Cisco Ios Xe 17.9.4 All All All
Operating System Cisco Ios Xe 17.9.4a All All All
Operating System Cisco Ios Xe 17.9.5 All All All
Operating System Cisco Ios Xe 17.9.6 All All All
Operating System Cisco Ios Xe 17.9.6a All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cisco Cisco IOS XE Software affected 16.6.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.2 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.3 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.4 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.5 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.4a Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.6 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.7 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.8 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.9 Not specified
CNA Cisco Cisco IOS XE Software affected 16.6.10 Not specified
CNA Cisco Cisco IOS XE Software affected 16.7.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.8.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.8.1a Not specified
CNA Cisco Cisco IOS XE Software affected 16.8.1s Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.2 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.1s Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.3 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.4 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.5 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.6 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.7 Not specified
CNA Cisco Cisco IOS XE Software affected 16.9.8 Not specified
CNA Cisco Cisco IOS XE Software affected 16.10.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.10.1s Not specified
CNA Cisco Cisco IOS XE Software affected 16.10.1e Not specified
CNA Cisco Cisco IOS XE Software affected 16.11.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.11.1b Not specified
CNA Cisco Cisco IOS XE Software affected 16.11.1s Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.1 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.1s Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.1c Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.2 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.3 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.8 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.2s Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.4 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.3s Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.3a Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.4a Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.5 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.6 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.5b Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.6a Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.7 Not specified
CNA Cisco Cisco IOS XE Software affected 16.12.14 Not specified
CNA Cisco Cisco IOS XE Software affected 17.1.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.1.1s Not specified
CNA Cisco Cisco IOS XE Software affected 17.1.1t Not specified
CNA Cisco Cisco IOS XE Software affected 17.1.3 Not specified
CNA Cisco Cisco IOS XE Software affected 17.2.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.2.1a Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.2 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.3 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.2a Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.4 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.5 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.6 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.4b Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.7 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.8 Not specified
CNA Cisco Cisco IOS XE Software affected 17.3.8a Not specified
CNA Cisco Cisco IOS XE Software affected 17.4.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.5.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.2 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.3 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.1y Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.4 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.5 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.6 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.6a Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.5a Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.7 Not specified
CNA Cisco Cisco IOS XE Software affected 17.6.8 Not specified
CNA Cisco Cisco IOS XE Software affected 17.7.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.10.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.10.1b Not specified
CNA Cisco Cisco IOS XE Software affected 17.8.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.2 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.3 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.4 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.5 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.4a Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.6 Not specified
CNA Cisco Cisco IOS XE Software affected 17.9.6a Not specified
CNA Cisco Cisco IOS XE Software affected 17.11.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.12.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.12.2 Not specified
CNA Cisco Cisco IOS XE Software affected 17.12.3 Not specified
CNA Cisco Cisco IOS XE Software affected 17.12.4 Not specified
CNA Cisco Cisco IOS XE Software affected 17.12.1z3 Not specified
CNA Cisco Cisco IOS XE Software affected 17.13.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.14.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.11.99SW Not specified
CNA Cisco Cisco IOS XE Software affected 17.15.1 Not specified
CNA Cisco Cisco IOS XE Software affected 17.15.2 Not specified
CNA Cisco Cisco IOS XE Software affected 17.15.2a Not specified
CNA Cisco Cisco IOS XE Software affected 17.15.2b Not specified
CNA Cisco Cisco IOS XE Software affected 17.16.1 Not specified

References

ReferenceSourceLinkTags
sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat9k-... [email protected] sec.cloudapps.cisco.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Exploits

CNA: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

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