CVE-2025-21434 [High] | Denial of Service in Qcs8300 Firmware

CVE-2025-21434 is rated Moderate Risk (56.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.88%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-18	0.45%	0.88%	+0.43%
2	2026-02-01	0.05%	0.45%	+0.40%
3	2025-04-07	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-18

0.45%

0.88%

+0.43%

2026-02-01

0.05%

0.45%

+0.40%

2025-04-07

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: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.	3.9	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

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

3.9

3.6

[email protected]

Affected software / configurations for CVE-2025-21434

Vendor	Product	Version	Raw CPE
qualcomm	qcs8300_firmware	—	cpe:2.3:o:qualcomm:qcs8300_firmware:-:::::::*
qualcomm	qcs8550_firmware	—	cpe:2.3:o:qualcomm:qcs8550_firmware:-:::::::*
qualcomm	qcs9100_firmware	—	cpe:2.3:o:qualcomm:qcs9100_firmware:-:::::::*
qualcomm	qfw7114_firmware	—	cpe:2.3:o:qualcomm:qfw7114_firmware:-:::::::*
qualcomm	qfw7124_firmware	—	cpe:2.3:o:qualcomm:qfw7124_firmware:-:::::::*
qualcomm	qmp1000_firmware	—	cpe:2.3:o:qualcomm:qmp1000_firmware:-:::::::*
qualcomm	video_collaboration_vc3_platform_firmware	—	cpe:2.3:o:qualcomm:video_collaboration_vc3_platform_firmware:-:::::::*
qualcomm	video_collaboration_vc5_platform_firmware	—	cpe:2.3:o:qualcomm:video_collaboration_vc5_platform_firmware:-:::::::*
qualcomm	sa6155p_firmware	—	cpe:2.3:o:qualcomm:sa6155p_firmware:-:::::::*
qualcomm	sa7255p_firmware	—	cpe:2.3:o:qualcomm:sa7255p_firmware:-:::::::*
qualcomm	sa7775p_firmware	—	cpe:2.3:o:qualcomm:sa7775p_firmware:-:::::::*
qualcomm	sa8155p_firmware	—	cpe:2.3:o:qualcomm:sa8155p_firmware:-:::::::*
qualcomm	sa8195p_firmware	—	cpe:2.3:o:qualcomm:sa8195p_firmware:-:::::::*
qualcomm	sa8255p_firmware	—	cpe:2.3:o:qualcomm:sa8255p_firmware:-:::::::*
qualcomm	sa8295p_firmware	—	cpe:2.3:o:qualcomm:sa8295p_firmware:-:::::::*
qualcomm	sa8530p_firmware	—	cpe:2.3:o:qualcomm:sa8530p_firmware:-:::::::*
qualcomm	sa8540p_firmware	—	cpe:2.3:o:qualcomm:sa8540p_firmware:-:::::::*
qualcomm	sa8620p_firmware	—	cpe:2.3:o:qualcomm:sa8620p_firmware:-:::::::*
qualcomm	sa8650p_firmware	—	cpe:2.3:o:qualcomm:sa8650p_firmware:-:::::::*
qualcomm	sa8770p_firmware	—	cpe:2.3:o:qualcomm:sa8770p_firmware:-:::::::*
qualcomm	sa8775p_firmware	—	cpe:2.3:o:qualcomm:sa8775p_firmware:-:::::::*
qualcomm	sa9000p_firmware	—	cpe:2.3:o:qualcomm:sa9000p_firmware:-:::::::*
qualcomm	sg8275p_firmware	—	cpe:2.3:o:qualcomm:sg8275p_firmware:-:::::::*
qualcomm	sm6650_firmware	—	cpe:2.3:o:qualcomm:sm6650_firmware:-:::::::*
qualcomm	sm7635_firmware	—	cpe:2.3:o:qualcomm:sm7635_firmware:-:::::::*
qualcomm	sm7675_firmware	—	cpe:2.3:o:qualcomm:sm7675_firmware:-:::::::*
qualcomm	sm7675p_firmware	—	cpe:2.3:o:qualcomm:sm7675p_firmware:-:::::::*
qualcomm	sm8550p_firmware	—	cpe:2.3:o:qualcomm:sm8550p_firmware:-:::::::*
qualcomm	sm8635_firmware	—	cpe:2.3:o:qualcomm:sm8635_firmware:-:::::::*
qualcomm	sm8635p_firmware	—	cpe:2.3:o:qualcomm:sm8635p_firmware:-:::::::*
qualcomm	sm8650q_firmware	—	cpe:2.3:o:qualcomm:sm8650q_firmware:-:::::::*
qualcomm	sm8735_firmware	—	cpe:2.3:o:qualcomm:sm8735_firmware:-:::::::*
qualcomm	sm8750_firmware	—	cpe:2.3:o:qualcomm:sm8750_firmware:-:::::::*
qualcomm	sm8750p_firmware	—	cpe:2.3:o:qualcomm:sm8750p_firmware:-:::::::*
qualcomm	snapdragon_8_gen_2_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8_gen_2_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_8_gen_3_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8_gen_3_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_8\+_gen_2_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8\+_gen_2_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_ar1_gen_1_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_ar1_gen_1_platform_firmware:-:::::::*
qualcomm	snapdragon_ar1_gen_1_platform_\"luna1\"_firmware	—	cpe:2.3:o:qualcomm:snapdragon_ar1_gen_1_platform_\"luna1\"_firmware:-:::::::*
qualcomm	snapdragon_ar2_gen_1_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_ar2_gen_1_platform_firmware:-:::::::*
qualcomm	ar8035_firmware	—	cpe:2.3:o:qualcomm:ar8035_firmware:-:::::::*
qualcomm	fastconnect_6700_firmware	—	cpe:2.3:o:qualcomm:fastconnect_6700_firmware:-:::::::*
qualcomm	fastconnect_6900_firmware	—	cpe:2.3:o:qualcomm:fastconnect_6900_firmware:-:::::::*
qualcomm	fastconnect_7800_firmware	—	cpe:2.3:o:qualcomm:fastconnect_7800_firmware:-:::::::*
qualcomm	qam8255p_firmware	—	cpe:2.3:o:qualcomm:qam8255p_firmware:-:::::::*
qualcomm	qam8295p_firmware	—	cpe:2.3:o:qualcomm:qam8295p_firmware:-:::::::*
qualcomm	qam8620p_firmware	—	cpe:2.3:o:qualcomm:qam8620p_firmware:-:::::::*
qualcomm	qam8650p_firmware	—	cpe:2.3:o:qualcomm:qam8650p_firmware:-:::::::*
qualcomm	qam8775p_firmware	—	cpe:2.3:o:qualcomm:qam8775p_firmware:-:::::::*
qualcomm	qamsrv1h_firmware	—	cpe:2.3:o:qualcomm:qamsrv1h_firmware:-:::::::*
qualcomm	qamsrv1m_firmware	—	cpe:2.3:o:qualcomm:qamsrv1m_firmware:-:::::::*
qualcomm	qca6391_firmware	—	cpe:2.3:o:qualcomm:qca6391_firmware:-:::::::*
qualcomm	qca6554a_firmware	—	cpe:2.3:o:qualcomm:qca6554a_firmware:-:::::::*
qualcomm	qca6564au_firmware	—	cpe:2.3:o:qualcomm:qca6564au_firmware:-:::::::*
qualcomm	qca6574_firmware	—	cpe:2.3:o:qualcomm:qca6574_firmware:-:::::::*
qualcomm	qca6574a_firmware	—	cpe:2.3:o:qualcomm:qca6574a_firmware:-:::::::*
qualcomm	qca6574au_firmware	—	cpe:2.3:o:qualcomm:qca6574au_firmware:-:::::::*
qualcomm	qca6584au_firmware	—	cpe:2.3:o:qualcomm:qca6584au_firmware:-:::::::*
qualcomm	qca6595_firmware	—	cpe:2.3:o:qualcomm:qca6595_firmware:-:::::::*
qualcomm	qca6595au_firmware	—	cpe:2.3:o:qualcomm:qca6595au_firmware:-:::::::*
qualcomm	qca6678aq_firmware	—	cpe:2.3:o:qualcomm:qca6678aq_firmware:-:::::::*
qualcomm	qca6688aq_firmware	—	cpe:2.3:o:qualcomm:qca6688aq_firmware:-:::::::*
qualcomm	qca6696_firmware	—	cpe:2.3:o:qualcomm:qca6696_firmware:-:::::::*
qualcomm	qca6698aq_firmware	—	cpe:2.3:o:qualcomm:qca6698aq_firmware:-:::::::*
qualcomm	qca6777aq_firmware	—	cpe:2.3:o:qualcomm:qca6777aq_firmware:-:::::::*
qualcomm	qca6787aq_firmware	—	cpe:2.3:o:qualcomm:qca6787aq_firmware:-:::::::*
qualcomm	qca6797aq_firmware	—	cpe:2.3:o:qualcomm:qca6797aq_firmware:-:::::::*
qualcomm	qca8081_firmware	—	cpe:2.3:o:qualcomm:qca8081_firmware:-:::::::*
qualcomm	qca8337_firmware	—	cpe:2.3:o:qualcomm:qca8337_firmware:-:::::::*
qualcomm	qcc2073_firmware	—	cpe:2.3:o:qualcomm:qcc2073_firmware:-:::::::*
qualcomm	qcc2076_firmware	—	cpe:2.3:o:qualcomm:qcc2076_firmware:-:::::::*
qualcomm	qcc710_firmware	—	cpe:2.3:o:qualcomm:qcc710_firmware:-:::::::*
qualcomm	qcm5430_firmware	—	cpe:2.3:o:qualcomm:qcm5430_firmware:-:::::::*
qualcomm	qcm6490_firmware	—	cpe:2.3:o:qualcomm:qcm6490_firmware:-:::::::*
qualcomm	qcm8550_firmware	—	cpe:2.3:o:qualcomm:qcm8550_firmware:-:::::::*
qualcomm	qcn6224_firmware	—	cpe:2.3:o:qualcomm:qcn6224_firmware:-:::::::*
qualcomm	qcn6274_firmware	—	cpe:2.3:o:qualcomm:qcn6274_firmware:-:::::::*
qualcomm	qcn9011_firmware	—	cpe:2.3:o:qualcomm:qcn9011_firmware:-:::::::*
qualcomm	qcn9012_firmware	—	cpe:2.3:o:qualcomm:qcn9012_firmware:-:::::::*
qualcomm	qcn9274_firmware	—	cpe:2.3:o:qualcomm:qcn9274_firmware:-:::::::*

References for CVE-2025-21434

URL	Tags
https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2025-bulletin.html	Vendor Advisory

URL

CVE-2025-21434 | Buffer Over-read in WLAN Host

Exploit prediction scoring system (EPSS) score for CVE-2025-21434

Common vulnerability scoring system (CVSS) metrics for CVE-2025-21434

Weakness enumeration for CVE-2025-21434

Affected software / configurations for CVE-2025-21434

References for CVE-2025-21434