What is the CVSS score of CVE-2024-8748?

CVE-2024-8748 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.5%.

Ax7501 B1 Firmware CVE-2024-8748

HIGH

Classic Buffer Overflow (CWE-120)

2024-12-03 security@zyxel.com.tw

Buffer Overflow Denial Of Service Zyxel Ax7501 B1 Firmware Dx3300 T0 Firmware Dx3300 T1 Firmware Dx3301 T0 Firmware Dx4510 B0 Firmware Dx4510 B1 Firmware Dx5401 B1 Firmware Ee6510 10 Firmware Emg3525 T50b Firmware Emg5523 T50b Firmware Emg6726 B10a Firmware Ex2210 T0 Firmware Ex3300 T0 Firmware Ex3300 T1 Firmware Ex3301 T0 Firmware Ex3500 T0 Firmware Ex3501 T0 Firmware Ex3510 B0 Firmware Ex3510 B1 Firmware Ex3600 T0 Firmware Ex5401 B1 Firmware Ex5510 B0 Firmware Ex5512 T0 Firmware Ex5601 T0 Firmware Ex5601 T1 Firmware Ex7501 B0 Firmware Ex7710 B0 Firmware Lte3301 Plus Firmware Nebula Lte3301 Plus Firmware Nebula Nr7101 Firmware Nr7101 Firmware Pm3100 T0 Firmware Pm5100 T0 Firmware Pm7300 T0 Firmware Px3321 T1 Firmware Px5301 T0 Firmware Vmg3625 T50b Firmware Vmg4005 B50a Firmware Vmg4005 B60a Firmware Vmg4927 B50a Firmware Vmg8623 T50b Firmware Wx3100 T0 Firmware Wx3401 B1 Firmware Wx5600 T0 Firmware Wx5610 B0 Firmware Dx5401 B0 Firmware Ex5401 B0 Firmware Ex5501 B0 Firmware Emg5723 T50K Firmware Vmg3927 B50B Firmware Vmg3927 T50K Firmware Vmg4005 B50B Firmware Vmg8825 T50K Firmware Ax7501 B0 Firmware Wx3401 B0 Firmware Lte5388 M804 Firmware Lte5398 M904 Firmware Lte7480 M804 Firmware Nr7102 Firmware Lte7490 M904 Firmware Nebula Nr5101 Firmware Ex5600 T1 Firmware Pm7500 T0 Firmware

7.5

CVSS 3.1 · Vendor: zyxel

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Vulnerability Assessment

Weakness	CWE CWE-120 ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could overflow a buffer to corrupt adjacent memory by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAI

A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K firmware versions through V5.50(ABOM.8.4)C0 could allow an attacker to cause a. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.

Affects your stack

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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K firmware versions through V5.50(ABOM.8.4)C0 could allow an attacker to cause a temporary denial of service (DoS) condition against the web management interface by sending a crafted HTTP POST request to a vulnerable device. Affected products include: Zyxel Lte3301-Plus Firmware, Zyxel Lte5388-M804 Firmware, Zyxel Lte5398-M904 Firmware, Zyxel Lte7480-M804 Firmware, Zyxel Lte7490-M904 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (zyxel) PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (zyxel) · only source for this CVE.

CVSS VectorVendor: zyxel

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K firmware versions through V5.50(ABOM.8.4)C0 could allow an attacker to cause a temporary denial of service (DoS) condition against the web management interface by sending a crafted HTTP POST request to a vulnerable device.

Threat Intelligence Overview

EPSS Score

0.5%

Top 61% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.5%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:o:zyxel:lte3301-plus_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:lte5388-m804_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:lte5398-m904_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:lte7480-m804_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:lte7490-m904_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:nr7101_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:nr7102_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:nebula_nr5101_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:nebula_nr7101_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:nebula_lte3301-plus_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx3300-t0_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx3300-t1_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx3301-t0_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx4510-b0_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx4510-b1_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx5401-b0_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:dx5401-b1_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:ee6510-10_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:ex2210-t0_firmware:*:*:*:*:*:*:*:*

cpe:2.3:o:zyxel:ex3300-t0_firmware:*:*:*:*:*:*:*:*

+ 45 more

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Same weakness CWE-120 – Classic Buffer Overflow

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References

Advisories & patches

ADVISORY https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-and-post-authentication-command-injection-vulnerabilities-in-some-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-and-wifi-extenders-12-03-2024

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