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CVE-2026-20084

Uncontrolled resource consumption in Cisco Ios Xe

CVSS score

8.6

EPSS probability

%0.4

Risk score

0.0

Published

6 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-20084 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets. There are workarounds that address this vulnerability.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20084 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1ciscoios xe View
2ciscoios xe View
3ciscoios xe View
4ciscoios xe View
5ciscoios xe View
6ciscoios xe View
7ciscoios xe View
8ciscoios xe View
9ciscoios xe View
10ciscoios xe View
11ciscoios xe View
12ciscoios xe View
13ciscoios xe View
14ciscoios xe View
15ciscoios xe View
16ciscoios xe View
17ciscoios xe View
18ciscoios xe View
19ciscoios xe View
20ciscoios xe View
21ciscoios xe View
22ciscoios xe View
23ciscoios xe View
24ciscoios xe View
25ciscoios xe View
26ciscoios xe View
27ciscoios xe View
28ciscoios xe View
29ciscoios xe View
30ciscoios xe View
31ciscoios xe View
32ciscoios xe View
33ciscoios xe View
34ciscoios xe View
35ciscoios xe View
36ciscoios xe View
37ciscoios xe View
38ciscoios xe View
39ciscoios xe View
40ciscoios xe View
41ciscoios xe View
42ciscoios xe View
43ciscoios xe View
44ciscoios xe View
45ciscoios xe View
46ciscoios xe View
47ciscoios xe View
48ciscoios xe View
49ciscoios xe View
50ciscoios xe View
51ciscoios xe View
52ciscoios xe View
53ciscoios xe View
54ciscoios xe View
55ciscoios xe View
56ciscoios xe View
57ciscoios xe View
58ciscoios xe View
59ciscoios xe View
60ciscoios xe View
61ciscoios xe View
62ciscoios xe View
63ciscoios xe View
64ciscoios xe View
65ciscoios xe View
66ciscoios xe View
67ciscoios xe View
68ciscoios xe View
69ciscoios xe View
70ciscoios xe View
71ciscoios xe View
72ciscoios xe View
73ciscoios xe View
74ciscoios xe View
75ciscoios xe View
76ciscoios xe View
77ciscoios xe View
78ciscoios xe View
79ciscoios xe View
80ciscoios xe View
81ciscoios xe View
82ciscoios xe View
83ciscoios xe View
84ciscoios xe View
85ciscoios xe View
86ciscoios xe View
87ciscoios xe View
88ciscoios xe View
89ciscoios xe View
90ciscoios xe View
91ciscoios xe View
92ciscoios xe View
93ciscoios xe View
94ciscoios xe View
95ciscoios xe View
96ciscoios xe View
97ciscoios xe View
98ciscoios xe View
99ciscoios xe View
100ciscoios xe View
101ciscoios xe View
102ciscoios xe View
103ciscoios xe View
104ciscoios xe View
105ciscoios xe View
106ciscoios xe View
107ciscoios xe View
Total affected vendors: 1|Products: 107

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
8.6CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20084 is associated with the following CWEs:

CWE-400: Common Weakness Enumeration Entry CWE-400

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20084 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxAvendor-advisory

CVSS Vector Radar Chart

8.6 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

C
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Weakness Type (CWE & CAPEC)

CWE-400

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