Vulnerability Intelligence Report
CVE-2023-6764
A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, and USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1 could allow an attacker to achieve unauthorized remote code execution by sending a sequence of specially crafted payloads containing an invalid pointer; however, such an attack would require detailed knowledge of an affected device’s memory layout and configuration.
No Active Exploit Signals
CVSS Base Score
8.1
HIGH
Exploitability:2.3
Impact Score:5.9
EPSS Probability:0.89%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-134 ↗CWE-134 Use of Externally-Controlled Format String
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Zyxel | ATP series firmware | version 4.32 through 5.37 Patch 1 (affected) |
| Zyxel | USG FLEX series firmware | version 4.50 through 5.37 Patch 1 (affected) |
| Zyxel | USG FLEX 50(W) series firmware | version 4.16 through 5.37 Patch 1 (affected) |
| Zyxel | USG20(W)-VPN series firmware | version 4.16 through 5.37 Patch 1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.889%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Zyxel Corporation · Vendor · Taiwan |
| Reserved | 2023-12-13T08:39:31 |
| Published | 2024-02-20T02:14:09 |
| Last Updated | 2024-08-02T08:42:07 |
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