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CVE-2026-20271Suited to automated attack · CISA

Cisco IOS XE Software Security Hardening Release

CVSS score

8.6

EPSS probability

%0.5

Risk score

0.0

Published

2 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-2026-20271 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20271 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-691.  

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20271 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1ciscoCisco IOS XE Software View
2ciscoios xe View
3ciscoios xe View
4ciscoios xe View
5ciscoios xe View
6ciscoios xe View
7ciscoios xe View
8ciscoios xe View
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10ciscoios xe View
11ciscoios xe View
12ciscoios xe View
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14ciscoios xe View
15ciscoios xe View
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18ciscoios xe View
19ciscoios xe View
20ciscoios xe View
21ciscoios xe View
22ciscoios xe View
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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
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40ciscoios xe View
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42ciscoios xe View
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44ciscoios xe View
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48ciscoios xe View
49ciscoios xe View
50ciscoios xe View
51ciscoios xe View
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55ciscoios xe View
56ciscoios xe View
57ciscoios xe View
58ciscoios xe View
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60ciscoios xe View
61ciscoios xe View
62ciscoios xe View
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69ciscoios xe View
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71ciscoios xe View
72ciscoios xe View
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80ciscoios xe View
81ciscoios xe View
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84ciscoios xe View
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86ciscoios xe View
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92ciscoios xe View
93ciscoios xe View
94ciscoios xe View
95ciscoios xe View
96ciscoios xe View
97ciscoios xe View
98ciscoios xe View
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100ciscoios xe View
101ciscoios xe View
102ciscoios xe View
103ciscoios xe View
104ciscoios xe View
105ciscoios xe View
106ciscoios xe View
107ciscoios xe View
108ciscoios xe View
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110ciscoios xe View
111ciscoios xe View
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113ciscoios xe View
114ciscoios xe View
115ciscoios xe View
116ciscoios xe View
117ciscoios xe View
118ciscoios xe View
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120ciscoios xe View
121ciscoios xe View
122ciscoios xe View
123ciscoios xe View
124ciscoios xe View
125ciscoios xe View
126ciscoios xe View
127ciscoios xe View
128ciscoios xe View
129ciscoios xe View
130ciscoios xe View
131ciscoios xe View
132ciscoios xe View
133ciscoios xe View
134ciscoios xe View
135ciscoios xe View
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140ciscoios xe View
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145ciscoios xe View
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147ciscoios xe View
148ciscoios xe View
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150ciscoios xe View
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152ciscoios xe View
153ciscoios xe View
154ciscoios xe View
155ciscoios xe View
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157ciscoios xe View
158ciscoios xe View
159ciscoios xe View
160ciscoios xe View
161ciscoios xe View
162ciscoios xe View
163ciscoios xe View
164ciscoios xe View
165ciscoios xe View
166ciscoios xe View
167ciscoios xe View
168ciscoios xe View
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170ciscoios xe View
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172ciscoios xe View
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174ciscoios xe View
175ciscoios xe View
176ciscoios xe View
177ciscoios xe View
178ciscoios xe View
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180ciscoios xe View
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182ciscoios xe View
183ciscoios xe View
184ciscoios xe View
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188ciscoios xe View
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192ciscoios xe View
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196ciscoios xe View
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198ciscoios xe View
199ciscoios xe View
200ciscoios xe View
Total affected vendors: 1|Products: 200

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 V3_1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HCVE CNA
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-2026-20271 is associated with the following CWEs:

CWE-691: Common Weakness Enumeration Entry CWE-691

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-2026-20271 weaknesses.

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

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

cisco-sa-hardening-iosxe-V8NMuMZJvendor-advisoryhttps://www.cve.org/Media/News/item/blog/2026/06/16/Preserving-Vulnerability-Level-Identificationnvd

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-691

Similar Vulnerabilities

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