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CVE-2026-20271

Cisco IOS XE Software Security Hardening Release

High8.6EPSS 0.47%
Published
Updated
Reserved
Assigned by
cisco

Description

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.  

Scores

CVSS scores of CVE-2026-20271, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Modified3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.47% · top 59% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

Affected products

  • Cisco · Cisco IOS XE Software

    • affected 17.2.1a
    • affected 16.12.1y
    • affected 16.12.3s
    • affected 16.7.1b
    • affected 16.6.2
    • affected 16.6.5
    • affected 16.12.1w
    • affected 16.9.1d
    • affected 17.3.1
    • affected 16.9.4c
    • affected 16.7.1
    • affected 17.2.1
    • affected 16.6.8
    • affected 16.9.1b
    • affected 16.9.2s
    • affected 16.12.4
    • affected 16.12.3a
    • affected 17.1.1s
    • affected 16.11.1a
    • affected 16.7.2
    • affected 16.11.1b
    • affected 16.9.1s
    • affected 16.9.3h
    • affected 16.9.1c
    • affected 16.6.5a
    • affected 16.6.3
    • affected 16.10.1f
    • affected 17.2.1v
    • affected 16.8.1e
    • affected 16.9.3a
    • affected 16.12.1a
    • affected 16.12.1x
    • affected 16.6.4s
    • affected 16.10.1c
    • affected 16.12.3
    • affected 16.11.2
    • affected 16.6.5b
    • affected 16.12.2s
    • affected 16.10.1b
    • affected 16.7.3
    • and 231 more

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .