CVE-2023-6399

🗓️ 20 Feb 2024 01:42:21Reported by ZyxelType

Zyxel firmware versions 4.32-5.37 Patch 1, USG FLEX, USG FLEX 50(W), USG20(W)-VPN series vulnerable to DoS via crafted hostnam

Reporter	Title	Published	Views	Family All 12
BDU FSTEC	Device Insight DoS	29 Feb 202400:00	–	bdu_fstec
Circl	CVE-2023-6399	20 Feb 202403:31	–	circl
CNNVD	Zyxel ATP Formatting String Error Vulnerability	20 Feb 202400:00	–	cnnvd
Cvelist	CVE-2023-6399	20 Feb 202401:42	–	cvelist
EUVD	EUVD-2023-58636	3 Oct 202520:07	–	euvd
NVD	CVE-2023-6399	20 Feb 202402:15	–	nvd
osv_cve	CVE-2023-6399	20 Feb 202402:15	–	osv_cve
Prion	Format string	20 Feb 202402:15	–	prion
Positive Technologies	PT-2023-8709 · Zyxel · Zyxel Usg Flex Series +3	30 Nov 202300:00	–	ptsecurity
Rapid7 Vulnerability Database (full)	CVE-2023-6399: Use of Externally-Controlled Format String	20 Feb 202400:00	–	rapid7

NVD

Vulners

Node

AND

zyxel atp100_firmwareRange5.10–5.37

zyxel atp100_firmwareMatch5.37-

zyxel atp100_firmwareMatch5.37patch1

zyxel atp100Match-

Node

AND

zyxel atp100w_firmwareRange5.10–5.37

zyxel atp100w_firmwareMatch5.37-

zyxel atp100w_firmwareMatch5.37patch1

zyxel atp100wMatch-

Node

AND

zyxel atp200_firmwareRange5.10–5.37

zyxel atp200_firmwareMatch5.37-

zyxel atp200_firmwareMatch5.37patch1

zyxel atp200Match-

Node

AND

zyxel atp500_firmwareRange5.10–5.37

zyxel atp500_firmwareMatch5.37-

zyxel atp500_firmwareMatch5.37patch1

zyxel atp500Match-

Node

AND

zyxel atp700_firmwareRange5.10–5.37

zyxel atp700_firmwareMatch5.37-

zyxel atp700_firmwareMatch5.37patch1

zyxel atp700Match-

Node

AND

zyxel atp800_firmwareRange5.10–5.37

zyxel atp800_firmwareMatch5.37-

zyxel atp800_firmwareMatch5.37patch1

zyxel atp800Match-

Node

AND

zyxel usg_flex_100_firmwareRange5.10–5.37

zyxel usg_flex_100_firmwareMatch5.37-

zyxel usg_flex_100_firmwareMatch5.37patch1

zyxel usg_flex_100Match-

Node

AND

zyxel usg_flex_100ax_firmwareRange5.10–5.37

zyxel usg_flex_100ax_firmwareMatch5.37-

zyxel usg_flex_100ax_firmwareMatch5.37patch1

zyxel usg_flex_100axMatch-

Node

AND

zyxel usg_flex_100h_firmwareRange5.10–5.37

zyxel usg_flex_100h_firmwareMatch5.37-

zyxel usg_flex_100h_firmwareMatch5.37patch1

zyxel usg_flex_100hMatch-

Node

AND

zyxel usg_flex_100w_firmwareRange5.10–5.37

zyxel usg_flex_100w_firmwareMatch5.37-

zyxel usg_flex_100w_firmwareMatch5.37patch1

zyxel usg_flex_100wMatch-

Node

AND

zyxel usg_flex_200_firmwareRange5.10–5.37

zyxel usg_flex_200_firmwareMatch5.37-

zyxel usg_flex_200_firmwareMatch5.37patch1

zyxel usg_flex_200Match-

Node

AND

zyxel usg_flex_200h_firmwareRange5.10–5.37

zyxel usg_flex_200h_firmwareMatch5.37-

zyxel usg_flex_200h_firmwareMatch5.37patch1

zyxel usg_flex_200hMatch-

Node

AND

zyxel usg_flex_200hp_firmwareRange5.10–5.37

zyxel usg_flex_200hp_firmwareMatch5.37-

zyxel usg_flex_200hp_firmwareMatch5.37patch1

zyxel usg_flex_200hpMatch-

Node

AND

zyxel usg_flex_500_firmwareRange5.10–5.37

zyxel usg_flex_500_firmwareMatch5.37-

zyxel usg_flex_500_firmwareMatch5.37patch1

zyxel usg_flex_500Match-

Node

AND

zyxel usg_flex_500h_firmwareRange5.10–5.37

zyxel usg_flex_500h_firmwareMatch5.37-

zyxel usg_flex_500h_firmwareMatch5.37patch1

zyxel usg_flex_500hMatch-

Node

AND

zyxel usg_flex_700_firmwareRange5.10–5.37

zyxel usg_flex_700_firmwareMatch5.37-

zyxel usg_flex_700_firmwareMatch5.37patch1

zyxel usg_flex_700Match-

Node

AND

zyxel usg_flex_700h_firmwareRange5.10–5.37

zyxel usg_flex_700h_firmwareMatch5.37-

zyxel usg_flex_700h_firmwareMatch5.37patch1

zyxel usg_flex_700hMatch-

Node

AND

zyxel usg_flex_50_firmwareRange5.10–5.37

zyxel usg_flex_50_firmwareMatch5.37-

zyxel usg_flex_50_firmwareMatch5.37patch1

zyxel usg_flex_50Match-

Node

AND

zyxel usg_flex_50w_firmwareRange5.10–5.37

zyxel usg_flex_50w_firmwareMatch5.37-

zyxel usg_flex_50w_firmwareMatch5.37patch1

zyxel usg_flex_50wMatch-

Node

AND

zyxel usg20-vpn_firmwareRange5.10–5.37

zyxel usg20-vpn_firmwareMatch5.37-

zyxel usg20-vpn_firmwareMatch5.37patch1

zyxel usg20-vpnMatch-

Node

AND

zyxel usg20w-vpn_firmwareRange5.10–5.37

zyxel usg20w-vpn_firmwareMatch5.37-

zyxel usg20w-vpn_firmwareMatch5.37patch1

zyxel usg20w-vpnMatch-

Node

AND

zyxel uosMatch1.10-

zyxel uosMatch1.10patch1

zyxel usg_flex_100hMatch-

zyxel usg_flex_100hpMatch-

zyxel usg_flex_200hMatch-

zyxel usg_flex_200hpMatch-

zyxel usg_flex_500hMatch-

zyxel usg_flex_700hMatch-

[
  {
    "defaultStatus": "unaffected",
    "product": "ATP series firmware",
    "vendor": "Zyxel",
    "versions": [
      {
        "status": "affected",
        "version": "version 4.32 through 5.37 Patch 1"
      }
    ]
  },
  {
    "defaultStatus": "unaffected",
    "product": "USG FLEX series firmware",
    "vendor": "Zyxel",
    "versions": [
      {
        "status": "affected",
        "version": "version 4.50 through 5.37 Patch 1"
      }
    ]
  },
  {
    "defaultStatus": "unaffected",
    "product": " USG FLEX 50(W) series firmware",
    "vendor": "Zyxel",
    "versions": [
      {
        "status": "affected",
        "version": "version 4.16 through 5.37 Patch 1"
      }
    ]
  },
  {
    "defaultStatus": "unaffected",
    "product": "USG20(W)-VPN series firmware",
    "vendor": "Zyxel",
    "versions": [
      {
        "status": "affected",
        "version": "version 4.16 through 5.37 Patch 1"
      }
    ]
  },
  {
    "defaultStatus": "unaffected",
    "product": "USG FLEX H series firmware",
    "vendor": "Zyxel",
    "versions": [
      {
        "status": "affected",
        "version": "version 1.10 through 1.10 Patch 1"
      }
    ]
  }
]

Source	Link
zyxel	www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024

17 Jun 2026 06:50Current

5.8Medium risk

Vulners AI Score5.8

CVSS 3.15.7 - 6.5

EPSS0.00649

SSVC

CWE-134