CVE-2025-20191

Multiple Cisco Products Denial of Service Vulnerability

Published May 7, 2025 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed

Description

A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco NX-OS Software

unknown

Version	Status	Constraints
`8.2(5)`	affected	—
`7.3(5)D1(1)`	affected	—
`8.4(2)`	affected	—
`8.4(3)`	affected	—
`9.2(3)`	affected	—
`9.2(2v)`	affected	—
`7.3(4)D1(1)`	affected	—
`8.2(1)`	affected	—
`9.2(1)`	affected	—
`9.2(2t)`	affected	—
`9.2(3y)`	affected	—
`7.0(3)I7(6z)`	affected	—
`9.3(2)`	affected	—
`7.0(3)I7(3z)`	affected	—
`7.0(3)IM7(2)`	affected	—
`7.0(3)I7(5a)`	affected	—
`8.1(1)`	affected	—
`8.2(2)`	affected	—
`8.3(2)`	affected	—
`7.3(2)D1(3a)`	affected	—
`9.2(4)`	affected	—
`8.1(2)`	affected	—
`7.3(3)D1(1)`	affected	—
`8.2(3)`	affected	—
`7.0(3)I7(2)`	affected	—
`7.0(3)I7(3)`	affected	—
`8.4(1)`	affected	—
`7.3(0)DX(1)`	affected	—
`7.3(2)D1(1)`	affected	—
`9.3(1)`	affected	—
`7.0(3)I7(6)`	affected	—
`7.3(2)D1(2)`	affected	—
`8.2(4)`	affected	—
`7.0(3)I7(4)`	affected	—
`7.0(3)I7(7)`	affected	—
`9.3(1z)`	affected	—
`9.2(2)`	affected	—
`8.1(2a)`	affected	—
`7.3(2)D1(3)`	affected	—
`7.0(3)I7(5)`	affected	—
`7.0(3)I7(1)`	affected	—
`7.0(3)IA7(2)`	affected	—
`7.0(3)IA7(1)`	affected	—
`8.3(1)`	affected	—
`7.3(1)D1(1)`	affected	—
`7.3(0)D1(1)`	affected	—
`9.3(3)`	affected	—
`7.3(2)D1(1d)`	affected	—
`7.0(3)I7(8)`	affected	—
`9.3(4)`	affected	—
`7.3(6)D1(1)`	affected	—
`8.2(6)`	affected	—
`9.3(5)`	affected	—
`7.0(3)I7(9)`	affected	—
`9.3(6)`	affected	—
`10.1(2)`	affected	—
`10.1(1)`	affected	—
`8.4(4)`	affected	—
`7.3(7)D1(1)`	affected	—
`9.3(5w)`	affected	—
`8.2(7)`	affected	—
`9.3(7)`	affected	—
`9.3(7k)`	affected	—
`7.0(3)I7(9w)`	affected	—
`10.2(1)`	affected	—
`7.3(8)D1(1)`	affected	—
`9.3(7a)`	affected	—
`8.2(7a)`	affected	—
`9.3(8)`	affected	—
`8.4(4a)`	affected	—
`8.4(5)`	affected	—
`7.0(3)I7(10)`	affected	—
`8.2(8)`	affected	—
`10.2(1q)`	affected	—
`10.2(2)`	affected	—
`9.3(9)`	affected	—
`10.1(2t)`	affected	—
`7.3(9)D1(1)`	affected	—
`10.2(3)`	affected	—
`8.4(6)`	affected	—
`10.2(3t)`	affected	—
`9.3(10)`	affected	—
`10.2(2a)`	affected	—
`8.2(9)`	affected	—
`10.3(1)`	affected	—
`10.2(4)`	affected	—
`8.4(7)`	affected	—
`10.3(2)`	affected	—
`8.4(6a)`	affected	—
`9.3(11)`	affected	—
`10.3(3)`	affected	—
`10.2(5)`	affected	—
`8.2(10)`	affected	—
`9.3(12)`	affected	—
`10.2(3v)`	affected	—
`10.4(1)`	affected	—
`8.4(8)`	affected	—
`10.3(99w)`	affected	—
`10.2(6)`	affected	—
`10.3(3w)`	affected	—
`10.3(99x)`	affected	—
`10.3(3o)`	affected	—
`8.4(9)`	affected	—
`10.3(4)`	affected	—
`10.3(3p)`	affected	—
`10.3(4a)`	affected	—
`10.4(2)`	affected	—
`10.3(3q)`	affected	—
`9.3(13)`	affected	—
`8.2(11)`	affected	—
`10.3(5)`	affected	—
`10.2(7)`	affected	—
`10.4(3)`	affected	—
`10.3(3x)`	affected	—
`10.3(4g)`	affected	—
`10.2(8)`	affected	—
`10.3(3r)`	affected	—
`9.3(14)`	affected	—
`10.3(4h)`	affected	—

Cisco

Cisco Wireless LAN Controller (WLC)

unknown

Version	Status	Constraints
`8.10.112.0`	affected	—
`8.8.120.0`	affected	—
`8.3.143.0`	affected	—
`8.3.111.0`	affected	—
`8.2.164.0`	affected	—
`8.5.109.0`	affected	—
`8.3.132.0`	affected	—
`8.5.105.0`	affected	—
`8.2.170.0`	affected	—
`8.2.160.0`	affected	—
`8.8.100.0`	affected	—
`8.9.111.0`	affected	—
`8.7.102.0`	affected	—
`8.3.102.0`	affected	—
`8.3.133.0`	affected	—
`8.3.131.0`	affected	—
`8.5.100.0`	affected	—
`8.5.131.0`	affected	—
`8.3.122.0`	affected	—
`8.5.101.0`	affected	—
`8.3.112.0`	affected	—
`8.5.120.0`	affected	—
`8.2.141.0`	affected	—
`8.3.141.0`	affected	—
`8.3.121.0`	affected	—
`8.2.151.0`	affected	—
`8.3.130.0`	affected	—
`8.5.102.0`	affected	—
`8.2.161.0`	affected	—
`8.5.151.0`	affected	—
`8.2.100.0`	affected	—
`8.5.135.0`	affected	—
`8.3.135.0`	affected	—
`8.5.140.0`	affected	—
`8.7.106.0`	affected	—
`8.9.100.0`	affected	—
`8.8.111.0`	affected	—
`8.2.110.0`	affected	—
`8.5.110.0`	affected	—
`8.2.130.0`	affected	—
`8.5.141.105`	affected	—
`8.2.121.0`	affected	—
`8.8.125.0`	affected	—
`8.3.150.0`	affected	—
`8.2.111.0`	affected	—
`8.10.105.0`	affected	—
`8.5.108.0`	affected	—
`8.3.108.0`	affected	—
`8.2.166.0`	affected	—
`8.5.103.0`	affected	—
`8.3.140.0`	affected	—
`8.6.101.0`	affected	—
`8.4.100.0`	affected	—
`8.5.160.0`	affected	—
`8.5.161.0`	affected	—
`8.8.130.0`	affected	—
`8.10.120.0`	affected	—
`8.10.121.0`	affected	—
`8.10.113.0`	affected	—
`8.10.122.0`	affected	—
`8.10.130.0`	affected	—
`8.10.141.0`	affected	—
`8.10.142.0`	affected	—
`8.5.171.0`	affected	—
`8.10.150.0`	affected	—
`8.10.151.0`	affected	—
`8.10.162.0`	affected	—
`8.5.182.0`	affected	—
`8.10.171.0`	affected	—
`8.10.180.0`	affected	—
`8.10.181.0`	affected	—
`8.10.182.0`	affected	—
`8.10.170.0`	affected	—
`8.10.183.0`	affected	—
`8.5.182.7`	affected	—
`8.5.182.105`	affected	—
`8.5.182.106`	affected	—
`8.10.185.0`	affected	—
`8.5.182.107`	affected	—
`8.5.182.11`	affected	—
`8.5.182.108`	affected	—
`8.10.190.0`	affected	—
`8.10.195.0`	affected	—
`8.5.182.12`	affected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-13915	A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.244% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sisf-dos-ZGwt4DdY

History

Jul 14, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00014}`	epss `{'score': 0.00015}`

May 7, 2025 8:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

May 7, 2025 5:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability in the Switch Integrated Security Features (SISF) of Cisco IOS Software, Cisco IOS XE Software, Cisco NX-OS Software, and Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the incorrect handling of DHCPv6 packets. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Title		Multiple Cisco Products Denial of Service Vulnerability
Weaknesses		CWE-805
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sisf-dos-ZGwt4DdY
Metrics		cvssV3_1 `{'score': 7.4, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}`