CVE-2021-1928 [Medium] | Out-of-bounds Read in Apq8009 Firmware

CVE-2021-1928 is rated Low Risk (19.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.14%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.04%	0.14%	+0.10%
2	2025-03-30	0.09%	0.04%	-0.04%
3	2025-03-29	—	0.09%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.04%

0.14%

+0.10%

2025-03-30

0.09%

0.04%

-0.04%

2025-03-29

—

0.09%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.6	3.1	MEDIUM	`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:P) Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	0.9	3.6	[email protected]
6.1	3.1	MEDIUM	`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H` Click to expand Attack vector (AV:P) Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	0.9	5.2	[email protected]
3.6	2.0	LOW	`AV:L/AC:L/Au:N/C:P/I:N/A:P` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	3.9	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.6

3.1

MEDIUM

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

Attack vector (AV:P): Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

0.9

3.6

[email protected]

6.1

3.1

MEDIUM

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

Attack vector (AV:P): Hands-on access—USB, keyboard, opening the case—not something you do purely over the wire.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

0.9

5.2

[email protected]

3.6

2.0

LOW

AV:L/AC:L/Au:N/C:P/I:N/A:P Click to expand

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

3.9

4.9

[email protected]

Affected software / configurations for CVE-2021-1928

Vendor	Product	Version	Raw CPE
qualcomm	apq8009_firmware	—	cpe:2.3:o:qualcomm:apq8009_firmware:-:::::::*
qualcomm	apq8053_firmware	—	cpe:2.3:o:qualcomm:apq8053_firmware:-:::::::*
qualcomm	ar9380_firmware	—	cpe:2.3:o:qualcomm:ar9380_firmware:-:::::::*
qualcomm	csr8811_firmware	—	cpe:2.3:o:qualcomm:csr8811_firmware:-:::::::*
qualcomm	ipq4018_firmware	—	cpe:2.3:o:qualcomm:ipq4018_firmware:-:::::::*
qualcomm	ipq4019_firmware	—	cpe:2.3:o:qualcomm:ipq4019_firmware:-:::::::*
qualcomm	ipq4028_firmware	—	cpe:2.3:o:qualcomm:ipq4028_firmware:-:::::::*
qualcomm	ipq4029_firmware	—	cpe:2.3:o:qualcomm:ipq4029_firmware:-:::::::*
qualcomm	ipq5010_firmware	—	cpe:2.3:o:qualcomm:ipq5010_firmware:-:::::::*
qualcomm	ipq5018_firmware	—	cpe:2.3:o:qualcomm:ipq5018_firmware:-:::::::*
qualcomm	ipq6000_firmware	—	cpe:2.3:o:qualcomm:ipq6000_firmware:-:::::::*
qualcomm	ipq6005_firmware	—	cpe:2.3:o:qualcomm:ipq6005_firmware:-:::::::*
qualcomm	ipq6010_firmware	—	cpe:2.3:o:qualcomm:ipq6010_firmware:-:::::::*
qualcomm	ipq6018_firmware	—	cpe:2.3:o:qualcomm:ipq6018_firmware:-:::::::*
qualcomm	ipq6028_firmware	—	cpe:2.3:o:qualcomm:ipq6028_firmware:-:::::::*
qualcomm	ipq8064_firmware	—	cpe:2.3:o:qualcomm:ipq8064_firmware:-:::::::*
qualcomm	ipq8065_firmware	—	cpe:2.3:o:qualcomm:ipq8065_firmware:-:::::::*
qualcomm	ipq8068_firmware	—	cpe:2.3:o:qualcomm:ipq8068_firmware:-:::::::*
qualcomm	ipq8069_firmware	—	cpe:2.3:o:qualcomm:ipq8069_firmware:-:::::::*
qualcomm	ipq8070_firmware	—	cpe:2.3:o:qualcomm:ipq8070_firmware:-:::::::*
qualcomm	ipq8070a_firmware	—	cpe:2.3:o:qualcomm:ipq8070a_firmware:-:::::::*
qualcomm	ipq8071_firmware	—	cpe:2.3:o:qualcomm:ipq8071_firmware:-:::::::*
qualcomm	ipq8071a_firmware	—	cpe:2.3:o:qualcomm:ipq8071a_firmware:-:::::::*
qualcomm	ipq8072_firmware	—	cpe:2.3:o:qualcomm:ipq8072_firmware:-:::::::*
qualcomm	ipq8072a_firmware	—	cpe:2.3:o:qualcomm:ipq8072a_firmware:-:::::::*
qualcomm	ipq8074_firmware	—	cpe:2.3:o:qualcomm:ipq8074_firmware:-:::::::*
qualcomm	ipq8074a_firmware	—	cpe:2.3:o:qualcomm:ipq8074a_firmware:-:::::::*
qualcomm	ipq8076_firmware	—	cpe:2.3:o:qualcomm:ipq8076_firmware:-:::::::*
qualcomm	ipq8076a_firmware	—	cpe:2.3:o:qualcomm:ipq8076a_firmware:-:::::::*
qualcomm	ipq8078_firmware	—	cpe:2.3:o:qualcomm:ipq8078_firmware:-:::::::*
qualcomm	ipq8078a_firmware	—	cpe:2.3:o:qualcomm:ipq8078a_firmware:-:::::::*
qualcomm	ipq8173_firmware	—	cpe:2.3:o:qualcomm:ipq8173_firmware:-:::::::*
qualcomm	ipq8174_firmware	—	cpe:2.3:o:qualcomm:ipq8174_firmware:-:::::::*
qualcomm	mdm9206_firmware	—	cpe:2.3:o:qualcomm:mdm9206_firmware:-:::::::*
qualcomm	pmp8074_firmware	—	cpe:2.3:o:qualcomm:pmp8074_firmware:-:::::::*
qualcomm	qca4024_firmware	—	cpe:2.3:o:qualcomm:qca4024_firmware:-:::::::*
qualcomm	qca6310_firmware	—	cpe:2.3:o:qualcomm:qca6310_firmware:-:::::::*
qualcomm	qca6320_firmware	—	cpe:2.3:o:qualcomm:qca6320_firmware:-:::::::*
qualcomm	qca6335_firmware	—	cpe:2.3:o:qualcomm:qca6335_firmware:-:::::::*
qualcomm	qca6428_firmware	—	cpe:2.3:o:qualcomm:qca6428_firmware:-:::::::*
qualcomm	qca6438_firmware	—	cpe:2.3:o:qualcomm:qca6438_firmware:-:::::::*
qualcomm	qca6694_firmware	—	cpe:2.3:o:qualcomm:qca6694_firmware:-:::::::*
qualcomm	qca7500_firmware	—	cpe:2.3:o:qualcomm:qca7500_firmware:-:::::::*
qualcomm	qca8072_firmware	—	cpe:2.3:o:qualcomm:qca8072_firmware:-:::::::*
qualcomm	qca8075_firmware	—	cpe:2.3:o:qualcomm:qca8075_firmware:-:::::::*
qualcomm	qca8081_firmware	—	cpe:2.3:o:qualcomm:qca8081_firmware:-:::::::*
qualcomm	qca9367_firmware	—	cpe:2.3:o:qualcomm:qca9367_firmware:-:::::::*
qualcomm	qca9377_firmware	—	cpe:2.3:o:qualcomm:qca9377_firmware:-:::::::*
qualcomm	qca9531_firmware	—	cpe:2.3:o:qualcomm:qca9531_firmware:-:::::::*
qualcomm	qca9558_firmware	—	cpe:2.3:o:qualcomm:qca9558_firmware:-:::::::*
qualcomm	qca9561_firmware	—	cpe:2.3:o:qualcomm:qca9561_firmware:-:::::::*
qualcomm	qca9563_firmware	—	cpe:2.3:o:qualcomm:qca9563_firmware:-:::::::*
qualcomm	qca9880_firmware	—	cpe:2.3:o:qualcomm:qca9880_firmware:-:::::::*
qualcomm	qca9882_firmware	—	cpe:2.3:o:qualcomm:qca9882_firmware:-:::::::*
qualcomm	qca9886_firmware	—	cpe:2.3:o:qualcomm:qca9886_firmware:-:::::::*
qualcomm	qca9887_firmware	—	cpe:2.3:o:qualcomm:qca9887_firmware:-:::::::*
qualcomm	qca9888_firmware	—	cpe:2.3:o:qualcomm:qca9888_firmware:-:::::::*
qualcomm	qca9889_firmware	—	cpe:2.3:o:qualcomm:qca9889_firmware:-:::::::*
qualcomm	qca9896_firmware	—	cpe:2.3:o:qualcomm:qca9896_firmware:-:::::::*
qualcomm	qca9898_firmware	—	cpe:2.3:o:qualcomm:qca9898_firmware:-:::::::*
qualcomm	qca9980_firmware	—	cpe:2.3:o:qualcomm:qca9980_firmware:-:::::::*
qualcomm	qca9982_firmware	—	cpe:2.3:o:qualcomm:qca9982_firmware:-:::::::*
qualcomm	qca9984_firmware	—	cpe:2.3:o:qualcomm:qca9984_firmware:-:::::::*
qualcomm	qca9985_firmware	—	cpe:2.3:o:qualcomm:qca9985_firmware:-:::::::*
qualcomm	qca9990_firmware	—	cpe:2.3:o:qualcomm:qca9990_firmware:-:::::::*
qualcomm	qca9992_firmware	—	cpe:2.3:o:qualcomm:qca9992_firmware:-:::::::*
qualcomm	qca9994_firmware	—	cpe:2.3:o:qualcomm:qca9994_firmware:-:::::::*
qualcomm	qcn5021_firmware	—	cpe:2.3:o:qualcomm:qcn5021_firmware:-:::::::*
qualcomm	qcn5022_firmware	—	cpe:2.3:o:qualcomm:qcn5022_firmware:-:::::::*
qualcomm	qcn5024_firmware	—	cpe:2.3:o:qualcomm:qcn5024_firmware:-:::::::*
qualcomm	qcn5052_firmware	—	cpe:2.3:o:qualcomm:qcn5052_firmware:-:::::::*
qualcomm	qcn5054_firmware	—	cpe:2.3:o:qualcomm:qcn5054_firmware:-:::::::*
qualcomm	qcn5064_firmware	—	cpe:2.3:o:qualcomm:qcn5064_firmware:-:::::::*
qualcomm	qcn5121_firmware	—	cpe:2.3:o:qualcomm:qcn5121_firmware:-:::::::*
qualcomm	qcn5122_firmware	—	cpe:2.3:o:qualcomm:qcn5122_firmware:-:::::::*
qualcomm	qcn5124_firmware	—	cpe:2.3:o:qualcomm:qcn5124_firmware:-:::::::*
qualcomm	qcn5152_firmware	—	cpe:2.3:o:qualcomm:qcn5152_firmware:-:::::::*
qualcomm	qcn5154_firmware	—	cpe:2.3:o:qualcomm:qcn5154_firmware:-:::::::*
qualcomm	qcn5164_firmware	—	cpe:2.3:o:qualcomm:qcn5164_firmware:-:::::::*
qualcomm	qcn5500_firmware	—	cpe:2.3:o:qualcomm:qcn5500_firmware:-:::::::*

References for CVE-2021-1928

URL	Tags
https://www.qualcomm.com/company/product-security/bulletins/august-2021-bulletin	Patch Vendor Advisory

URL

CVE-2021-1928

Exploit prediction scoring system (EPSS) score for CVE-2021-1928

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1928

Weakness enumeration for CVE-2021-1928

Affected software / configurations for CVE-2021-1928

References for CVE-2021-1928