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CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
Cisco IOS and IOS XE · in CISA KEV since 2023-10-10
2023-10-10added to KEV
2023-10-31federal remediation due date
2.34%EPSS exploit probability (30 days) 82.9th percentile
6.6 MEDIUMCVSS 3.1
Unknownknown ransomware use
13days from NVD publication to KEV
What it is
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 (CISA)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-787 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2023-09-27 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2023-20109.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.