ClosedPatched

Cisco IOS and IOS XE: Group Encrypted Transport VPN Out-of-Bounds Write (CVE-2023-20109)

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 CISA KEV on 2023-10-10.

Why this severity: CVSS 6.6 (NVD), actively exploited (CISA KEV)

Started: Oct 10, 2023
Closed: Oct 10, 2023
CVE: CVE-2023-20109

Follow this incident

Updated Oct 10, 2023

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

Oct 10, 2023
CISA added CVE-2023-20109 to the KEV catalog (due 2023-10-31).

Advisories3

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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