CVE-2023-5593

7.8 highEPSS 0.2%

High (7.8) in zyxel secuextender ssl vpn. EPSS 0.2% chance of exploitation in the next 30 days.

The out-of-bounds write vulnerability in the Windows-based SecuExtender SSL VPN Client software version 4.0.4.0 could allow an authenticated local user to gain a privilege escalation by sending a crafted CREATE message.

Severity

CVSS 3.1

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 12% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2023-11-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zyxel:secuextender_ssl_vpn

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-out-of-bounds-write-vulnerability-in-secuextender-ssl-vpn-client-software
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-out-of-bounds-write-vulnerability-in-secuextender-ssl-vpn-client-software

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