What is the CVSS score of CVE-2025-21455?

CVE-2025-21455 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: 0.0%.

How to fix or mitigate CVE-2025-21455?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Fastconnect 6800 Firmware CVE-2025-21455

HIGH

Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)

2025-08-06 product-security@qualcomm.com

Buffer Overflow Qualcomm Fastconnect 6800 Firmware Fastconnect 6900 Firmware Fastconnect 7800 Firmware Qca6391 Firmware Qca6426 Firmware Qca6436 Firmware Qsm8250 Firmware Sd865 5g Firmware Sdx55 Firmware Snapdragon 8 Gen 1 Mobile Platform Firmware Snapdragon 865 5g Mobile Platform Firmware Snapdragon X55 5g Modem Rf System Firmware Snapdragon Xr2 5g Platform Firmware Sw5100 Firmware Sw5100p Firmware Sxr2130 Firmware Sxr2230p Firmware Sxr2250p Firmware Wcd9380 Firmware Wcd9385 Firmware Wcn3980 Firmware Wcn3988 Firmware Wsa8810 Firmware Wsa8815 Firmware Wsa8830 Firmware Wsa8832 Firmware Wsa8835 Firmware Snapdragon 865 5G Mobile Platform Sm8250 Ab Firmware Snapdragon 870 5G Mobile Platform Sm8250 Ac Firmware

7.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-367 OWASP Top 10:2025 A04:2021 - Insecure Design ASVS 5.0 V15 - Secure Coding and Architecture TOCTOU prevention
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: 0.01%.
Exploit ScenarioDerived	Successful exploitation could compromise the high-severity affected system.

This Month Plan within 30 days. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Memory corruption while submitting blob data to kernel space though IOCTL. 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. 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-367. Memory corruption while submitting blob data to kernel space though IOCTL. Affected products include: Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6426 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 while submitting blob data to kernel space though IOCTL.

Executive ViewAI

Why It Matters

CVE-2025-21455 presents notable security risk 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) 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

0.0%

Top 97% exploitable

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 0.0%

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.

Affected Products (CPE)CVE.org

cpe:2.3:o:qualcomm:fastconnect_6800_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:fastconnect_6900_firmware:-:*:*:*:*:*:*:*

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

cpe:2.3:o:qualcomm:qca6391_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:qca6426_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:qca6436_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:qsm8250_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sd865_5g_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sdx55_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_8_gen_1_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_865_5g_mobile_platform_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_865\+_5g_mobile_platform_\(sm8250-ab\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_870_5g_mobile_platform_\(sm8250-ac\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_x55_5g_modem-rf_system_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:snapdragon_xr2_5g_platform_firmware:-:*:*:*:*:*:*:*

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

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

cpe:2.3:o:qualcomm:sxr2130_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sxr2230p_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:qualcomm:sxr2250p_firmware:-:*:*:*:*:*:*:*

+ 9 more

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References

Advisories & patches

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

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GitHub PoC

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