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Medium severity · published Feb 20, 2024
CVE-2023-6397
A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1…
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1 could allow a LAN-based attacker to cause denial-of-service (DoS) conditions by downloading a crafted RAR compressed file onto a LAN-side host if the firewall has the “Anti-Malware” feature enabled.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% 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
Affected product
AF
Atp100 Firmware
Zyxel
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-6397
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-6397
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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