What is the CVSS score of CVE-2025-21436?

CVE-2025-21436 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-21436?

Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

Fastconnect 7800 Firmware CVE-2025-21436

HIGH

Use After Free (CWE-416)

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

Buffer Overflow Use After Free Memory Corruption Qualcomm Fastconnect 7800 Firmware Qmp1000 Firmware Sm8735 Firmware Sm8750 Firmware Sm8750p Firmware Snapdragon 8 Gen 3 Mobile Platform Firmware Sw5100 Firmware Sw5100p Firmware Sxr2330p Firmware Wcd9378 Firmware Wcd9380 Firmware Wcd9390 Firmware Wcd9395 Firmware Wcn7750 Firmware Wcn7860 Firmware Wcn7861 Firmware Wcn7880 Firmware Wcn7881 Firmware Wsa8830 Firmware Wsa8832 Firmware Wsa8835 Firmware Wsa8840 Firmware Wsa8845 Firmware Wsa8845h Firmware Snapdragon W5 Gen 1 Wearable Platform Firmware

7.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-416 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Memory lifecycle management MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation 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 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.07%.
Exploit ScenarioDerived	A local attacker with access to the system could access freed memory to execute arbitrary code or crash the application.

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

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Memory corruption may occur while initiating two IOCTL calls simultaneously to create processes from two different threads. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Use smart pointers or garbage-collected languages. Set pointers to NULL after freeing. Enable memory sanitizers.

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 as Use After Free (CWE-416), which allows attackers to access freed memory to execute arbitrary code or crash the application. Memory corruption may occur while initiating two IOCTL calls simultaneously to create processes from two different threads. Affected products include: Qualcomm Fastconnect 7800 Firmware, Qualcomm Qmp1000 Firmware, Qualcomm Sm8735 Firmware, Qualcomm Sm8750 Firmware, Qualcomm Sm8750P Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

Memory corruption may occur while initiating two IOCTL calls simultaneously to create processes from two different threads.

Executive ViewAI

Why It Matters

CVE-2025-21436 presents notable security risk, a use-after-free vulnerability rated CVSS 7.8. 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) Enable ASLR and DEP where available; (2) Implement network segmentation; (3) Monitor for exploitation indicators.

Threat Intelligence Overview

EPSS Score

0.1%

Top 79% 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 0.1%

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

Small

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +39

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.

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Affected Products (CPE)CVE.org

cpe:2.3:o:qualcomm:fastconnect_7800_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:qmp1000_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sm8735_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sm8750_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sm8750p_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_8_gen_3_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_w5\+_gen_1_wearable_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sw5100_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sw5100p_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sxr2330p_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9378_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9380_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9390_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcd9395_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn7750_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn7860_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn7861_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn7880_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wcn7881_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:wsa8830_firmware:-:*:*:*:*:*:*:*

+ 5 more

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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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