What’s Vulnerable › Vulnerabilities

CVE-2026-21371: Buffer Over-read in WinBlast Driver

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-06 · updated 2026-10-26
• Weakness: CWE-126

Description

Memory Corruption when retrieving output buffer with insufficient size validation.

Affected products

• Qualcomm Aqt1000 Firmware: all versions
• Qualcomm Cologne Firmware: all versions
• Qualcomm Fastconnect 6200 Firmware: all versions
• Qualcomm Fastconnect 6700 Firmware: all versions
• Qualcomm Fastconnect 6800 Firmware: all versions
• Qualcomm Fastconnect 6900 Firmware: all versions
• Qualcomm Fastconnect 7800 Firmware: all versions
• Qualcomm Qca0000 Firmware: all versions
• Qualcomm Qca6391 Firmware: all versions
• Qualcomm Qca6420 Firmware: all versions
• Qualcomm Qca6430 Firmware: all versions
• Qualcomm Qcm5430 Firmware: all versions
• Qualcomm Qcm6490 Firmware: all versions
• Qualcomm Sc8380Xp Firmware: all versions
• Qualcomm Sm6250 Firmware: all versions
• Qualcomm Snapdragon 460 Mobile Platform Firmware: all versions
• Qualcomm Snapdragon 662 Mobile Platform Firmware: all versions
• Qualcomm Snapdragon 7C+ Gen 3 Compute Firmware: all versions
• Qualcomm Snapdragon 7C Compute Platform Firmware: all versions
• Qualcomm Snapdragon 7C Gen 2 Compute Platform Firmware: all versions
• Qualcomm Snapdragon 8C Compute Platform (Sc8180Xp-Ad) Firmware: all versions
• Qualcomm Snapdragon 8C Compute Platform Firmware: all versions
• Qualcomm Snapdragon 8Cx Compute Platform "Poipu Pro" Firmware: all versions
• Qualcomm Snapdragon 8Cx Compute Platform Firmware: all versions
• Qualcomm Snapdragon 8Cx Gen 2 5G Compute Platform "Poipu Pro" Firmware: all versions
• Qualcomm Snapdragon 8Cx Gen 2 5G Compute Platform Firmware: all versions
• Qualcomm Snapdragon 8Cx Gen 3 Compute Platform Firmware: all versions
• Qualcomm Video Collaboration Vc3 Platform Firmware: all versions
• Qualcomm Wcd9340 Firmware: all versions
• Qualcomm Wcd9341 Firmware: all versions

References

• https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html

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