Local privilege escalation via crafted CREATE message
Published Nov 20, 2023 · Updated Aug 29, 2024
Out-of-bounds write in Zyxel SecuExtender SSL VPN Client 4.0.4.0 allows local users to gain elevated privileges via a crafted CREATE message. The client mishandles a crafted CREATE message and writes beyond an intended buffer, but Zyxel has not identified the affected component or operation. Successful exploitation requires local authenticated access on Windows and grants higher privileges with potential control over confidentiality, integrity, and availability.
Summary
What happened
Out-of-bounds write in Zyxel SecuExtender SSL VPN Client 4.0.4.0 allows local users to gain elevated privileges via a crafted CREATE message. The client mishandles a crafted CREATE message and writes beyond an intended buffer, but Zyxel has not identified the affected component or operation. Successful exploitation requires local authenticated access on Windows and grants higher privileges with potential control over confidentiality, integrity, and availability.
The record
- CVE
- CVE-2023-5593
- Published
- Nov 20, 2023
- Updated
- Aug 29, 2024
- Vendor
- Zyxel Networks
- Product
- SecuExtender SSL VPN Client
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 20, 2023CVE publishedPublication date reported by the CVE source.
- Aug 29, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.0.4.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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