CVE-2023-22915

🗓️ 24 Apr 2023 00:00:00Reported by ZyxelType

CVE-2023-22915 buffer overflow in Zyxel USG FLEX firmware, allowing DoS

Reporter	Title	Published	Views	Family All 12
BDU FSTEC	The vulnerability of the fbwifi_forward.cgi component of the Zyxel USG FLEX, USG FLEX 50(W), USG20(W)-VPN, and VPN network devices allows a hacker to cause service interruptions.	6 Dec 202300:00	–	bdu_fstec
Circl	CVE-2023-22915	24 Apr 202320:19	–	circl
CNNVD	Zyxel USG FLEX 安全漏洞	24 Apr 202300:00	–	cnnvd
Cvelist	CVE-2023-22915	24 Apr 202300:00	–	cvelist
EUVD	EUVD-2023-27017	3 Oct 202520:07	–	euvd
NCSC	Vulnerabilities fixed in Zyxel Firewalls and Access Points	25 Apr 202300:00	–	ncsc
NVD	CVE-2023-22915	24 Apr 202317:15	–	nvd
Prion	Buffer overflow	24 Apr 202317:15	–	prion
Positive Technologies	PT-2023-03: Unauth Buffer Overflow in fbwifi_forward.cgi in Zyxel products	25 Apr 202300:00	–	ptsecurity
Positive Technologies	PT-2023-7451 · Zyxel · Zyxel Vpn Series +3	10 Jan 202300:00	–	ptsecurity

NVD

Node

zyxel usg_flex_100_firmwareRange4.50–5.35

AND

zyxel usg_flex_100Match-

Node

zyxel usg_flex_100w_firmwareRange4.50–5.35

AND

zyxel usg_flex_100wMatch-

Node

zyxel usg_flex_200_firmwareRange4.50–5.35

AND

zyxel usg_flex_200Match-

Node

zyxel usg_flex_50_firmwareRange4.50–5.35

AND

zyxel usg_flex_50Match-

Node

zyxel usg_flex_50w_firmwareRange4.30–5.35

AND

zyxel usg_flex_50wMatch-

Node

zyxel usg_flex_500_firmwareRange4.50–5.35

AND

zyxel usg_flex_500Match-

Node

zyxel usg_flex_700_firmwareRange4.50–5.35

AND

zyxel usg_flex_700Match-

Node

zyxel vpn100_firmwareRange4.50–5.35

AND

zyxel vpn100Match-

Node

zyxel vpn1000_firmwareRange4.50–5.35

AND

zyxel vpn1000Match-

Node

zyxel vpn300_firmwareRange4.50–5.35

AND

zyxel vpn300Match-

Node

zyxel vpn50_firmwareRange4.50–5.35

AND

zyxel vpn50Match-

Node

zyxel usg_20w-vpn_firmwareRange4.30–5.35

AND

zyxel usg_20w-vpnMatch-

[
  {
    "vendor": "Zyxel",
    "product": "USG FLEX series firmware",
    "versions": [
      {
        "version": "4.50 through 5.35",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "Zyxel",
    "product": "USG FLEX 50(W) firmware",
    "versions": [
      {
        "version": "4.30 through 5.35",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "Zyxel",
    "product": "USG20(W)-VPN firmware",
    "versions": [
      {
        "version": "4.30 through 5.35",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "Zyxel",
    "product": "VPN series firmware",
    "versions": [
      {
        "version": "4.30 through 5.35",
        "status": "affected"
      }
    ]
  }
]

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

17 Jun 2026 05:36Current

7.7High risk

Vulners AI Score7.7

CVSS 3.17.5

EPSS0.01054

SSVC

CWE-120