High
Cisco IOS XE Software Security Hardening Release
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.
Announced Group revision 1
Original source ↗CVE-2026-20271
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-20271
Cisco IOS XE Software
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Cisco",
"product": "Cisco IOS XE Software",
"versions": [
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{
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{
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{
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{
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{
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{
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{
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{
"status": "affected",
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{
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{
"status": "affected",
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{
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},
{
"status": "affected",
"version": "26.1.1a"
},
{
"status": "affected",
"version": "17.15.7"
},
{
"status": "affected",
"version": "16.12.16"
},
{
"status": "affected",
"version": "17.18.5x"
},
{
"status": "affected",
"version": "26.1.3"
},
{
"status": "affected",
"version": "17.12.9"
},
{
"status": "affected",
"version": "17.18.5"
}
],
"defaultStatus": "unknown"
}
]- Related CVEs
- CVE-2026-20271
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #8197 · Revision 1
- Added to Heist Feed
- Publisher date