Home/CVE/A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 thr
CVE

CVE-2023-6764

A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 thr

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.

HIGH · CVSS 8.1 EPSS 0.02332
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-134Use of Externally-Controlled Format String
CWE-134Use of Externally-Controlled Format String
▤

Affected Products & Versions

40
zyxel atp100 firmware>= 4.32 and < 5.37
zyxel atp100 firmwareall versions
zyxel atp100w firmware>= 4.32 and < 5.37
zyxel atp100w firmwareall versions
zyxel atp200 firmware>= 4.32 and < 5.37
zyxel atp200 firmwareall versions
zyxel atp500 firmware>= 4.32 and < 5.37
zyxel atp500 firmwareall versions
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · security@zyxel.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD20 Feb 2024 · 03:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024Vendor Advisory
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