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CVE-2023-27989

MEDIUM
6.5
CVSS Score
Published: June 5, 2023 at 11:02 AM UTC
Updated: June 17, 2026 at 05:46 AM UTC
8 products affected across 1 vendorNebula NR7101 FirmwareNR7101 firmwareLte7480-m804 Firmware

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A buffer overflow vulnerability in the CGI program of the Zyxel NR7101 firmware versions prior to V1.00(ABUV.8)C0 could allow a remote authenticated attacker to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.

Affected

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

Lte7480-m804 Firmware· Zyxel
95%
v ≤ 1.00(abra.6)c0
zyxel-lte7480-m804 (same device)
Lte7490-m904 Firmware· Zyxel
95%
v ≤ 1.00(abqy.5)c0
zyxel-lte7490-m904 (same device)
Nebula NR7101 Firmware· Zyxel
95%
v ≤ 1.15(accc.3)c0
zyxel-nebula-nr7101 (same device)
NR7101 firmware· Zyxel
95%
v ≤ 1.00(abuv.7)c0< V1.00(ABUV.8)C0
zyxel-nr7101 (same device)
Lte7480-M804· Zyxeldevice
80%
All versions
Lte7490-M904· Zyxeldevice
80%
All versions
Nebula Nr7101· Zyxeldevice
80%
All versions
Nr7101· Zyxeldevice
80%
All versions

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 AdvisoryPatchThird Party Advisory
Source: [email protected]
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerability-in-4g-lte-and-5g-nr-outdoor-routers

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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