October 10, 2023 · Applied Cybernetics Group
CVE-2023-20109 — Cisco IOS and IOS XE
Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability
- Added to KEV
2023-10-10- Federal due date
2023-10-31- Vendor
- Cisco
- Product
- IOS and IOS XE
- EPSS
- 81.7th percentile (score 0.023, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1059 , T1078 , T1499 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-20109
CISA short 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.