Detections
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Amazon Linux 2023 : openvpn, openvpn-devel (ALAS2023-2026-1990)
medium Nessus Plugin ID 328485
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Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1990 advisory.An attacker controlling an HTTP proxy (or performing MITM on the plaintext pre-TLS proxy connection) can trigger a single 0-byte overrun to a buffer on the stack by sending a crafted NTLM Type 2 challenge response. (CVE-2026-11771)
If the active TLS session has a pending dedicated ACK packet, tls_multi_process sets to_link to ks->ack_write_buf. If in the same execution of tls_multi_process, the initializing session reaches the authenticated stage, the active session will be freed which leaves to_link.data pointing to freed memory.
(CVE-2026-12996)
openvpn Server crash on reception of suitably malformed auth-token, if --auth-gen-token external-auth is active (CVE-2026-13122)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Run 'dnf update openvpn --releasever 2023.12.20260720' or or 'dnf update --advisory ALAS2023-2026-1990 --releasever 2023.12.20260720' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1990.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-11771.html
Plugin Details
Severity: Medium
ID: 328485
File Name: al2023_ALAS2023-2026-1990.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 7/20/2026
Updated: 7/20/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.3
Percentile: 96.71
CVSS v2
Risk Factor: Medium
Base Score: 4.9
Temporal Score: 3.6
Vector: CVSS2#AV:N/AC:H/Au:S/C:N/I:N/A:C
CVSS Score Source: CVE-2026-13122
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Temporal Score: 4.6
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 5.9
Threat Score: 2
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:openvpn-debuginfo, p-cpe:/a:amazon:linux:openvpn-debugsource, p-cpe:/a:amazon:linux:openvpn-devel, p-cpe:/a:amazon:linux:openvpn
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 7/20/2026
Vulnerability Publication Date: 7/1/2026
Reference Information
CVE: CVE-2026-11771, CVE-2026-12996, CVE-2026-13122
IAVA: 2026-A-0662