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CVE-2022-43391

MEDIUM
6.5
CVSS Score
Published: January 11, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 05:06 AM UTC
96 products affected across 1 vendorEmg5523-t50b FirmwareEmg3525-t50b FirmwareVmg8623-t50b Firmware

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

A buffer overflow vulnerability in the parameter of the CGI program in Zyxel NR7101 firmware prior to V1.15(ACCC.3)C0, which could allow an authenticated attacker to cause denial-of-service (DoS) conditions by sending a crafted HTTP request.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

AX7501-B0 firmware· Zyxel
95%
All versions
zyxel-ax7501-b0 (same device)
DX3301-T0 firmware· Zyxel
95%
All versions
zyxel-dx3301-t0 (same device)
Dx4510-b1 Firmware· Zyxel
95%
All versions
zyxel-dx4510-b1 (same device)
DX5401-B0 firmware· Zyxel
95%
All versions
zyxel-dx5401-b0 (same device)
Emg3525-t50b Firmware· Zyxel
95%
All versions
zyxel-emg3525-t50b (same device)
Emg5523-t50b Firmware· Zyxel
95%
All versions
zyxel-emg5523-t50b (same device)
Emg5723-t50k Firmware· Zyxel
95%
All versions
zyxel-emg5723-t50k (same device)
EX3301-T0 firmware· Zyxel
95%
All versions
zyxel-ex3301-t0 (same device)
Ex3510-b0 Firmware· Zyxel
95%
v < 5.17(abup.7)c0
Affected range stops below 5.17(abup.7)c0, so it looks safe — our inference, not a vendor statement
zyxel-ex3510-b0 (same device)
Ex5401-b0 Firmware· Zyxel
95%
All versions
zyxel-ex5401-b0 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-buffer-overflow-vulnerabilities-of-cpe-fiber-onts-and-wifi-extenders

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMZyxel
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-120

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