Medium severity · published Feb 20, 2024
CVE-2023-6399
A format string vulnerability 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…
6.5
CVSS
0.6%
EPSS
No
On KEV
Description
A format string vulnerability 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, USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1, and USG FLEX H series firmware versions from 1.10 through 1.10 Patch 1 could allow an authenticated IPSec VPN user to cause DoS conditions against the “deviceid” daemon by sending a crafted hostname to an affected device if it has the “Device Insight” feature enabled.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AF
Atp100 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp100w Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp200 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp500 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp700 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
AF
Atp800 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
UO
Uos · Zyxel
1.10; 1.10 · source: NVD
UF
Usg Flex 100 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100ax Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100h Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 100w Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
UF
Usg Flex 200 Firmware · Zyxel
5.10 before 5.37; 5.37; 5.37 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6399
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-6399
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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