What is CVE-2026-20124?

CVE-2026-20124 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.7/10. Published 2026-08-05.

How severe is CVE-2026-20124?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Cisco Ios Xe Software

CVE-2026-20124

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software could allow an authenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. T…

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

Affected products

Cisco Ios Xe Software — versions 17.2.1a, 3.18.7SP, 16.12.1y

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

psirt@cisco.com

Frequently asked questions

What is CVE-2026-20124?: CVE-2026-20124 is a high-severity vulnerability in Cisco Ios Xe Software, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.7/10. Published 2026-08-05.
How severe is CVE-2026-20124?: High severity. CVSS v3 base score is 7.7 out of 10.