CVE Watch—

CVE-2023-20109

Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability

CVSS

—

No CVSS

EPSS

2.5%

p84

KEV

YES

Oct 10, 2023

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

2.3%EPSS · 30 days2.5%

2026-09-162026-10-14

KEV catalog record

Product

Cisco / IOS and IOS XE

Vulnerability

Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability

Added to KEV

Oct 10, 2023

Remediate by

Oct 31, 2023

Known ransomware use

Summary description

Cisco IOS and IOS XE contain an out-of-bounds write vulnerability in the Group Encrypted Transport VPN (GET VPN) feature that could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute malicious code or cause a device to crash.

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-getvpn-rce-g8qR68sx; https://nvd.nist.gov/vuln/detail/CVE-2023-20109

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2025-203527.7 HIG

98.6%

KEV—80Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability20d CVE-2018-0171—

99.9%

KEV—80Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability—CVE-2017-3881—

99.9%

KEV—80Cisco IOS and IOS XE Remote Code Execution Vulnerability—