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Critical severity · published May 24, 2023
CVE-2023-33009
Zyxel Multiple Firewalls Buffer Overflow Vulnerability
In wildKEV
9.8
CVSS
28.1%
EPSS
Yes
On KEV
Description
A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)28.1% · higher than 98% of CVEs
Exploited in the wildYes
CISA KEVListed Jun 5, 2023
Federal remediation dueJun 26, 2023
Ransomware campaign useNot known
Affected products
Which versions
AS
ATP series firmware · Zyxel
4.60 through 5.36 Patch 1 · source: vendor
UF
USG FLEX 50(W) firmware · Zyxel
4.60 through 5.36 Patch 1 · source: vendor
UF
USG FLEX series firmware · Zyxel
4.60 through 5.36 Patch 1 · source: vendor
UF
USG20(W)-VPN firmware · Zyxel
4.60 through 5.36 Patch 1 · source: vendor
VS
VPN series firmware · Zyxel
4.60 through 5.36 Patch 1 · source: vendor
ZS
ZyWALL/USG series firmware · Zyxel
4.60 through 4.73 Patch 1 · source: vendor
AF
Atp100 Firmware · Zyxel
4.60 before 5.36; 5.36; 5.36 · source: NVD
AF
Atp100w Firmware · Zyxel
4.60 before 5.36; 5.36; 5.36 · source: NVD
AF
Atp200 Firmware · Zyxel
4.60 before 5.36; 5.36; 5.36 · source: NVD
AF
Atp500 Firmware · Zyxel
4.60 before 5.36; 5.36; 5.36 · source: NVD
AF
Atp700 Firmware · Zyxel
4.60 before 5.36; 5.36; 5.36 · source: NVD
AF
Atp800 Firmware · Zyxel
4.60 before 5.36; 5.36; 5.36 · source: NVD
Affected product
AS
ATP series firmware
Zyxel
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-33009
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-33009
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
www.zyxel.com
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls
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