CVE-2023-5593
CVE-2023-5593 is a high-severity vulnerability in Zyxel Secuextender Ssl Vpn with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- EPSS exploit prediction: 0% (12th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-787
- Affected product: Zyxel Secuextender Ssl Vpn
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2023-5593?
- 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.
- How severe is CVE-2023-5593?
- CVE-2023-5593 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2023-5593 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2023-5593?
- CVE-2023-5593 affects Zyxel Secuextender Ssl Vpn. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2023-5593?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2023-5593 published?
- CVE-2023-5593 was published on 2023-11-20 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:zyxel:secuextender_ssl_vpn:4.0.4.0:*:*:*:*:windows:*:*
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