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%.

Which versions of Fastconnect 6800 Firmware are affected by CVE-2025-21455?

CVE-2025-21455 presents notable security risk rated CVSS 7.8. Exploitation could compromise the security of affected deployments.

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 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

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:05 vuln.today

CVE Published

Aug 06, 2025 - 08:15 nvd

HIGH 7.8

DescriptionNVD

Memory corruption while submitting blob data to kernel space though IOCTL.

AnalysisAI

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.

Technical ContextAI

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.

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.

CVE-2025-21455 vulnerability details – vuln.today

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Fastconnect 6800 Firmware CVE-2025-21455

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code