Vulnerability Details : CVE-2023-4398
An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions on an affected device by sending a crafted IKE packet.
Vulnerability category: OverflowDenial of service
Products affected by CVE-2023-4398
- cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-4398
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 38 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-4398
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
Zyxel Corporation |
CWE ids for CVE-2023-4398
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The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by: security@zyxel.com.tw (Primary)
References for CVE-2023-4398
-
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps
Zyxel security advisory for multiple vulnerabilities in firewalls and APs | Zyxel NetworksVendor Advisory
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