CVE-2020-3703 [Critical] | Out-of-bounds Read in Apq8053 Firmware

u'Buffer over-read issue in Bluetooth peripheral firmware due to lack of check for invalid opcode and length of opcode received from central device(This CVE is equivalent to Link Layer Length Overfow issue (CVE-2019-16336,CVE-2019-17519) and Silent Length Overflow issue(CVE-2019-17518) mentioned in sweyntooth paper)' in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice & Music in APQ8053, APQ8076, AR9344, Bitra, Kamorta, MDM9206, MDM9207C, MDM9607, MSM8905, MSM8917, MSM8937, MSM8940, MSM8953, Nicobar, QCA6174A, QCA9377, QCM2150, QCM6125, QCS404, QCS405, QCS605, QCS610, QM215, Rennell, SC8180X, SDM429, SDM439, SDM450, SDM630, SDM632, SDM636, SDM660, SDM670, SDM710, SDM845, SDX20, SDX24, SM6150, SM7150, SM8150, SXR1130

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.29%	0.70%	+0.42%
2	2025-03-30	0.56%	0.29%	-0.27%
3	2025-03-29	—	0.56%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.29%

0.70%

+0.42%

2025-03-30

0.56%

0.29%

-0.27%

2025-03-29

—

0.56%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. 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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. 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:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

7.5

2.0

HIGH

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

Access vector (AV:N): Can be exploited remotely over network reachability.
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:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

6.4

[email protected]

Affected software / configurations for CVE-2020-3703

Vendor	Product	Version	Raw CPE
qualcomm	apq8053_firmware	—	cpe:2.3:o:qualcomm:apq8053_firmware:-:::::::*
qualcomm	apq8076_firmware	—	cpe:2.3:o:qualcomm:apq8076_firmware:-:::::::*
qualcomm	ar9344_firmware	—	cpe:2.3:o:qualcomm:ar9344_firmware:-:::::::*
qualcomm	bitra_firmware	—	cpe:2.3:o:qualcomm:bitra_firmware:-:::::::*
qualcomm	kamorta_firmware	—	cpe:2.3:o:qualcomm:kamorta_firmware:-:::::::*
qualcomm	mdm9206_firmware	—	cpe:2.3:o:qualcomm:mdm9206_firmware:-:::::::*
qualcomm	mdm9207c_firmware	—	cpe:2.3:o:qualcomm:mdm9207c_firmware:-:::::::*
qualcomm	mdm9607_firmware	—	cpe:2.3:o:qualcomm:mdm9607_firmware:-:::::::*
qualcomm	msm8905_firmware	—	cpe:2.3:o:qualcomm:msm8905_firmware:-:::::::*
qualcomm	msm8917_firmware	—	cpe:2.3:o:qualcomm:msm8917_firmware:-:::::::*
qualcomm	msm8937_firmware	—	cpe:2.3:o:qualcomm:msm8937_firmware:-:::::::*
qualcomm	msm8940_firmware	—	cpe:2.3:o:qualcomm:msm8940_firmware:-:::::::*
qualcomm	msm8953_firmware	—	cpe:2.3:o:qualcomm:msm8953_firmware:-:::::::*
qualcomm	nicobar_firmware	—	cpe:2.3:o:qualcomm:nicobar_firmware:-:::::::*
qualcomm	qca6174a_firmware	—	cpe:2.3:o:qualcomm:qca6174a_firmware:-:::::::*
qualcomm	qca9377_firmware	—	cpe:2.3:o:qualcomm:qca9377_firmware:-:::::::*
qualcomm	qcm2150_firmware	—	cpe:2.3:o:qualcomm:qcm2150_firmware:-:::::::*
qualcomm	qcm6125_firmware	—	cpe:2.3:o:qualcomm:qcm6125_firmware:-:::::::*
qualcomm	qcs404_firmware	—	cpe:2.3:o:qualcomm:qcs404_firmware:-:::::::*
qualcomm	qcs405_firmware	—	cpe:2.3:o:qualcomm:qcs405_firmware:-:::::::*
qualcomm	qcs605_firmware	—	cpe:2.3:o:qualcomm:qcs605_firmware:-:::::::*
qualcomm	qcs610_firmware	—	cpe:2.3:o:qualcomm:qcs610_firmware:-:::::::*
qualcomm	qm215_firmware	—	cpe:2.3:o:qualcomm:qm215_firmware:-:::::::*
qualcomm	rennell_firmware	—	cpe:2.3:o:qualcomm:rennell_firmware:-:::::::*
qualcomm	sc8180x_firmware	—	cpe:2.3:o:qualcomm:sc8180x_firmware:-:::::::*
qualcomm	sdm429_firmware	—	cpe:2.3:o:qualcomm:sdm429_firmware:-:::::::*
qualcomm	sdm439_firmware	—	cpe:2.3:o:qualcomm:sdm439_firmware:-:::::::*
qualcomm	sdm450_firmware	—	cpe:2.3:o:qualcomm:sdm450_firmware:-:::::::*
qualcomm	sdm630_firmware	—	cpe:2.3:o:qualcomm:sdm630_firmware:-:::::::*
qualcomm	sdm632_firmware	—	cpe:2.3:o:qualcomm:sdm632_firmware:-:::::::*
qualcomm	sdm636_firmware	—	cpe:2.3:o:qualcomm:sdm636_firmware:-:::::::*
qualcomm	sdm660_firmware	—	cpe:2.3:o:qualcomm:sdm660_firmware:-:::::::*
qualcomm	sdm670_firmware	—	cpe:2.3:o:qualcomm:sdm670_firmware:-:::::::*
qualcomm	sdm710_firmware	—	cpe:2.3:o:qualcomm:sdm710_firmware:-:::::::*
qualcomm	sdm845_firmware	—	cpe:2.3:o:qualcomm:sdm845_firmware:-:::::::*
qualcomm	sdx20_firmware	—	cpe:2.3:o:qualcomm:sdx20_firmware:-:::::::*
qualcomm	sdx24_firmware	—	cpe:2.3:o:qualcomm:sdx24_firmware:-:::::::*
qualcomm	sm6150_firmware	—	cpe:2.3:o:qualcomm:sm6150_firmware:-:::::::*
qualcomm	sm7150_firmware	—	cpe:2.3:o:qualcomm:sm7150_firmware:-:::::::*
qualcomm	sm8150_firmware	—	cpe:2.3:o:qualcomm:sm8150_firmware:-:::::::*
qualcomm	sxr1130_firmware	—	cpe:2.3:o:qualcomm:sxr1130_firmware:-:::::::*

References for CVE-2020-3703

URL	Tags
https://www.qualcomm.com/company/product-security/bulletins/october-2020-bulletin	Broken Link
https://www.qualcomm.com/company/product-security/bulletins/october-2020-security-bulletin	Vendor Advisory

URL

CVE-2020-3703

Exploit prediction scoring system (EPSS) score for CVE-2020-3703

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3703

Weakness enumeration for CVE-2020-3703

Affected software / configurations for CVE-2020-3703

References for CVE-2020-3703