How severe is CVE-2021-30306?

CVE-2021-30306 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-30306 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30306?

CVE-2021-30306 primarily affects Qualcomm Apq8053 Firmware. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-30306?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-30306 published?

CVE-2021-30306 was published on 2021-10-20 and last updated on 2026-06-17.

CVE-2021-30306

CVE-2021-30306 is a high-severity vulnerability in Qualcomm Apq8053 Firmware with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 8.4)
CVSS v2: 3.6
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Qualcomm Apq8053 Firmware
Published: 2021-10-20
Last modified: 2026-06-17

Description

Possible buffer over read due to improper buffer allocation for file length passed from user space in Snapdragon Auto, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

Frequently asked questions

What is CVE-2021-30306?: Possible buffer over read due to improper buffer allocation for file length passed from user space in Snapdragon Auto, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile
How severe is CVE-2021-30306?: CVE-2021-30306 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-30306 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30306?: CVE-2021-30306 primarily affects Qualcomm Apq8053 Firmware. In total, 65 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-30306?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-30306 published?: CVE-2021-30306 was published on 2021-10-20 and last updated on 2026-06-17.

References

https://www.qualcomm.com/company/product-security/bulletins/october-2021-bulletin

Affected products (65)

cpe:2.3:o:qualcomm:apq8053_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:msm8953_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6174a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6390_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6391_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6426_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6574_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6574a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6574au_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6595au_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca6696_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qca9377_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qcm6490_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qcs6490_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:qrb5165_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa6145p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa6150p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa6155_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa6155p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa8145p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa8150p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa8155_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa8155p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sa8195p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd460_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd480_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd662_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd690_5g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd750g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd765_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd765g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd768g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd778g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd780g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd865_5g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd870_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd888_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sd888_5g_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sdx12_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:qualcomm:sdx55m_firmware:-:*:*:*:*:*:*:*

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CVE-2021-1933 — Critical (CVSS 9.8): UE assertion is possible due to improper validation of invite message with SDP body in Snapdragon Auto, Snapdragon…
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CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
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