What is the CVSS score of CVE-2025-21428?

CVE-2025-21428 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: 0.4%.

How to fix or mitigate CVE-2025-21428?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

9206 Lte Modem Firmware CVE-2025-21428

HIGH

Buffer Over-read (CWE-126)

2025-04-07 product-security@qualcomm.com

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-126 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer over-read prevention
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.35%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

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

No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Memory corruption occurs while connecting a STA to an AP and initiating an ADD TS request from the AP to establish a TSpec session. 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. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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 under CWE-126. Memory corruption occurs while connecting a STA to an AP and initiating an ADD TS request from the AP to establish a TSpec session. Affected products include: Qualcomm Snapdragon 439 Mobile Platform Firmware, Qualcomm Snapdragon 625 Mobile Platform Firmware, Qualcomm Snapdragon 626 Mobile Platform Firmware, Qualcomm Snapdragon 632 Mobile Platform Firmware, Qualcomm Snapdragon 820 Automotive Platform Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionCVE.org

Memory corruption occurs while connecting a STA to an AP and initiating an ADD TS request from the AP to establish a TSpec session.

Executive ViewAI

Why It Matters

CVE-2025-21428 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: High

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score

0.4%

Top 43% exploitable

Data Quality

3 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 0.4%

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

High

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.

Affected Products (CPE)CVE.org

cpe:2.3:o:qualcomm:snapdragon_439_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_625_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_626_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_632_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_820_automotive_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_auto_5g_modem-rf_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_x12_lte_modem_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_x35_5g_modem-rf_system_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_x5_lte_modem_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:vision_intelligence_100_platform_\(apq8053-aa\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:vision_intelligence_200_platform_\(apq8053-ac\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9326_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9330_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9335_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9340_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn3610_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn3615_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn3620_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn3660b_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn3680_firmware:-:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2025-bulletin.html

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GitHub PoC

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