--- title: "CVE-2023-20109: Out-of-bounds Write | CubePath" description: "A vulnerability in the Cisco Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS Software and Cisco IOS XE Software…" language: en source: https://cubepath.com/security/cve/CVE-2023-20109 --- # CVE-2023-20109: Out-of-bounds Write | CubePath ## Description A vulnerability in the Cisco Group Encrypted Transport VPN (GET VPN) feature of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, remote attacker who has administrative control of either a group member or a key server to execute arbitrary code on an affected device or cause the device to crash. This vulnerability is due to insufficient validation of attributes in the Group Domain of Interpretation (GDOI) and G-IKEv2 protocols of the GET VPN feature. An attacker could exploit this vulnerability by either compromising an installed key server or modifying the configuration of a group member to point to a key server that is controlled by the attacker. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a denial of service (DoS) condition. For more information, see the Details \["#details"\] section of this advisory. Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-20109) ## Key data ### CVSS 3.1 Medium 6.6 Score published by cisco in the CVE record. CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | High | The attack depends on conditions outside the attacker's control, so it takes preparation. | | Privileges required | High | An account with significant privileges, such as an administrator, is needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.02504 (2.5% probability) Percentile 84.9% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability Added to the catalog Oct 10, 2023 Federal due date Oct 31, 2023 ### CISA assessment as of Oct 23, 2024 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable no Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-787](https://cwe.mitre.org/data/definitions/787.html) Out-of-bounds Write ## Affected products Products listed in the CVE record, as the CNA published them. - Cisco IOS - affected: 12.4(24)T - affected: 12.4(24)T3 - affected: 12.4(22)T1 - affected: 12.4(24)T5 - affected: 12.4(24)T4 - affected: 12.4(22)T - affected: 12.4(24)T8 - affected: 12.4(24)T2 - affected: 12.4(22)T5 - affected: 12.4(22)T4 - affected: 12.4(24)T1 - affected: 12.4(24)T7 - affected: 12.4(22)T3 - affected: 12.4(24)T6 - affected: 12.4(22)T2 - affected: 12.4(24)T4a - affected: 12.4(24)T4b - affected: 12.4(24)T3e - affected: 12.4(24)T4c - affected: 12.4(24)T4d - affected: 12.4(24)T4e - affected: 12.4(24)T3f - affected: 12.4(24)T4f - affected: 12.4(24)T4l - affected: 12.4(24)MD1 - and 649 more - Cisco IOS XE Software - affected: 3.7.0S - affected: 3.7.1S - affected: 3.7.2S - affected: 3.7.3S - affected: 3.7.4S - affected: 3.7.5S - affected: 3.7.6S - affected: 3.7.7S - affected: 3.7.4aS - affected: 3.7.2tS - affected: 3.7.0bS - affected: 3.7.1aS - affected: 3.3.0SG - affected: 3.3.2SG - affected: 3.3.1SG - affected: 3.8.0S - affected: 3.8.1S - affected: 3.8.2S - affected: 3.9.1S - affected: 3.9.0S - affected: 3.9.2S - affected: 3.9.1aS - affected: 3.9.0aS - affected: 3.4.0SG - affected: 3.4.2SG - and 339 more ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [cisco-sa-getvpn-rce-g8qR68sx](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-getvpn-rce-g8qR68sx) (sec.cloudapps.cisco.com) ## Timeline 1. ID reserved Oct 27, 2022 2. Record published Sep 27, 2023 3. Added to CISA KEV Oct 10, 2023 4. Record last updated Oct 21, 2025 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:01 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)