Overview
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.
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-getvpn-rce-g8qR68sx; https://nvd.nist.gov/vuln/detail/CVE-2023-20109
Key Details
| Property | Value |
|---|---|
| CVE ID | CVE-2023-20109 |
| Vendor / Product | Cisco — IOS and IOS XE |
| NVD Published | 2023-09-27 |
| NVD Last Modified | 2025-10-28 |
| CVSS 3.1 Score | 6.6 |
| CVSS 3.1 Vector | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| Severity | MEDIUM |
| CWE | CWE-787 |
| CISA KEV Added | 2023-10-10 |
| CISA KEV Deadline | 2023-10-31 |
| Known Ransomware Use | No |
CVSS 3.1 Breakdown
Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Required Action
CISA BOD 22-01 Deadline: 2023-10-31.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Timeline
| Date | Event |
|---|---|
| 2023-10-10 | Added to CISA Known Exploited Vulnerabilities catalog |
| 2023-10-31 | CISA BOD 22-01 remediation deadline |
References
| Resource | Type |
|---|---|
| NVD — CVE-2023-20109 | Vulnerability Database |
| CISA KEV Catalog Entry | US Government |