CVE-2023-6764
Zyxel · published 2024-02-20
Source record Collected from the National Vulnerability Database (NVD)
Description
Description by Zyxel Corporation via the CVE Program.
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.
Status at the source
- NVD status: Analyzed
Affected products, as the source lists them
| Vendor | Product | 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 |
Added by CISA-ADP (Authorized Data Publisher)
| Vendor | Product | Versions |
|---|---|---|
| zyxel | atp_firmware | 4.32 – 5.37patch1 and earlier: affected |
| zyxel | usg_flex_firmware | 4.50 – 5.37patch1 and earlier: affected |
| zyxel | usg_flex_50w_firmware | 4.16 – 5.37patch1 and earlier: affected |
| zyxel | usg_20w-vpn_firmware | 4.16 – 5.37patch1 and earlier: affected |
Products named in NVD's CPE match criteria (21)
cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_100ax_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_100h_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_200h_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_200hp_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_500h_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_700h_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 8.1 HIGH — as published by Zyxel Corporation (Secondary)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - SSVC — CISA's assessment (SSVC 2.0.3, CISA Coordinator): Exploitation: none · Automatable: no · Technical impact: total
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024
Source dates: published 2024-02-20, last changed 2026-06-17. DeSpy's copy of this version is dated 2026-09-28.
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