CVE•Published 2026-08-05•Modified 2026-08-17•1 article on news•5 live references•NVD data

CVE-2026-20273Cisco · Ios_xe

Vulnerability data via NVD (ingested)

CVSS v3.1

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS percentile

Exploit Prediction Scoring System · top 81% of all CVEs

Weaknesses (CWE)

CWE-20Improper Input Validation

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 a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20273 are related to improper input validation issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-20.

Timeline

Published 2026-08-05

Modified 2026-08-17

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag3,734 hosts

vuln:CVE-2026-20273

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · OS

os:"Ios Xe"

Hosts Shodan identified as running Ios Xe.

More intel sources (5)

Shodan report

vuln:CVE-2026-20273

Country / ASN / product breakdown for the vuln query.

Censys

vulnerabilities.cve_id: CVE-2026-20273