High severity · published Feb 20, 2024
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…
8.1
CVSS
0.9%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Atp100 Firmware · Zyxel
4.32 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp100w Firmware · Zyxel
4.32 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp200 Firmware · Zyxel
4.32 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp500 Firmware · Zyxel
4.32 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp700 Firmware · Zyxel
4.32 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp800 Firmware · Zyxel
4.32 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100 Firmware · Zyxel
4.50 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100ax Firmware · Zyxel
4.50 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100h Firmware · Zyxel
4.50 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100w Firmware · Zyxel
4.50 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 200 Firmware · Zyxel
4.50 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 200h Firmware · Zyxel
4.50 before 5.37; 5.37; 5.37 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6764
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-6764
Vendor Advisory
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024
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