CVEvulnerability

CVE-2023-20109

6.6 MEDIUM Known exploited Published 2023-09-27 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

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

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.

Added to KEV: 2023-10-10
Remediation due: 2023-10-31
Ransomware use: Unknown
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

Status: Analyzed
Published: 2023-09-27
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.6 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected]): 6.6 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weaknesses: CWE-787

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.

Affected configurations

• cisco ios 12.4\(22\)md • cisco ios 12.4\(22\)md1 • cisco ios 12.4\(22\)md2 • cisco ios 12.4\(22\)mda • cisco ios 12.4\(22\)mda1 • cisco ios 12.4\(22\)mda2 • cisco ios 12.4\(22\)mda3 • cisco ios 12.4\(22\)mda4 • cisco ios 12.4\(22\)mda5 • cisco ios 12.4\(22\)mda6 • cisco ios 12.4\(22\)t • cisco ios 12.4\(22\)t1 • cisco ios 12.4\(22\)t2 • cisco ios 12.4\(22\)t3 • cisco ios 12.4\(22\)t4 • cisco ios 12.4\(22\)t5 • cisco ios 12.4\(22\)xr1 • cisco ios 12.4\(22\)xr2 • cisco ios 12.4\(22\)xr3 • cisco ios 12.4\(22\)xr4 • cisco ios 12.4\(22\)xr5 • cisco ios 12.4\(22\)xr6 • cisco ios 12.4\(22\)xr7 • cisco ios 12.4\(22\)xr8 • cisco ios 12.4\(22\)xr9 • cisco ios 12.4\(22\)xr10 • cisco ios 12.4\(22\)xr11 • cisco ios 12.4\(22\)xr12 • cisco ios 12.4\(24\)md • cisco ios 12.4\(24\)md1 • cisco ios 12.4\(24\)md2 • cisco ios 12.4\(24\)md3 • cisco ios 12.4\(24\)md4 • cisco ios 12.4\(24\)md5 • cisco ios 12.4\(24\)md6 • cisco ios 12.4\(24\)md7 • cisco ios 12.4\(24\)mda1 • cisco ios 12.4\(24\)mda2 • cisco ios 12.4\(24\)mda3 • cisco ios 12.4\(24\)mda4 • cisco ios 12.4\(24\)mda5 • cisco ios 12.4\(24\)mda6 • cisco ios 12.4\(24\)mda7 • cisco ios 12.4\(24\)mda8 • cisco ios 12.4\(24\)mda9 • cisco ios 12.4\(24\)mda10 • cisco ios 12.4\(24\)mda11 • cisco ios 12.4\(24\)mda12 • cisco ios 12.4\(24\)mda13 • cisco ios 12.4\(24\)mdb • cisco ios 12.4\(24\)mdb1 • cisco ios 12.4\(24\)mdb3 • cisco ios 12.4\(24\)mdb4 • cisco ios 12.4\(24\)mdb5 • cisco ios 12.4\(24\)mdb5a • cisco ios 12.4\(24\)mdb6 • cisco ios 12.4\(24\)mdb7 • cisco ios 12.4\(24\)mdb8 • cisco ios 12.4\(24\)mdb9 • cisco ios 12.4\(24\)mdb10 … and 978 more

Weakness · CWE (1)

CWE-787 Out-of-bounds Write weakness

References