CVE-2026-21381 [High] | Denial of Service in Ar8035 Firmware

CVE-2026-21381 is rated Low Risk (32.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.15%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.04%	0.15%	+0.11%
2	2026-04-07	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.04%

0.15%

+0.11%

2026-04-07

—

0.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.6	3.1	HIGH	`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. 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.	1.0	6.0	[email protected]
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

7.6

3.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.

1.0

6.0

[email protected]

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-2026-21381

Vendor	Product	Version	Raw CPE
qualcomm	ar8035_firmware	—	cpe:2.3:o:qualcomm:ar8035_firmware:-:::::::*
qualcomm	cologne_firmware	—	cpe:2.3:o:qualcomm:cologne_firmware:-:::::::*
qualcomm	fastconnect_6200_firmware	—	cpe:2.3:o:qualcomm:fastconnect_6200_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	fwa_gen_3_ultra_firmware	—	cpe:2.3:o:qualcomm:fwa_gen_3_ultra_firmware:-:::::::*
qualcomm	g2_gen_1_firmware	—	cpe:2.3:o:qualcomm:g2_gen_1_firmware:-:::::::*
qualcomm	milos_firmware	—	cpe:2.3:o:qualcomm:milos_firmware:-:::::::*
qualcomm	netrani_firmware	—	cpe:2.3:o:qualcomm:netrani_firmware:-:::::::*
qualcomm	orne_firmware	—	cpe:2.3:o:qualcomm:orne_firmware:-:::::::*
qualcomm	palawan25_firmware	—	cpe:2.3:o:qualcomm:palawan25_firmware:-:::::::*
qualcomm	pandeiro_firmware	—	cpe:2.3:o:qualcomm:pandeiro_firmware:-:::::::*
qualcomm	qca6391_firmware	—	cpe:2.3:o:qualcomm:qca6391_firmware:-:::::::*
qualcomm	qca6698au_firmware	—	cpe:2.3:o:qualcomm:qca6698au_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	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	qcs8550_firmware	—	cpe:2.3:o:qualcomm:qcs8550_firmware:-:::::::*
qualcomm	qfw7114_firmware	—	cpe:2.3:o:qualcomm:qfw7114_firmware:-:::::::*
qualcomm	qfw7124_firmware	—	cpe:2.3:o:qualcomm:qfw7124_firmware:-:::::::*
qualcomm	qln1083bd_firmware	—	cpe:2.3:o:qualcomm:qln1083bd_firmware:-:::::::*
qualcomm	qln1086bd_firmware	—	cpe:2.3:o:qualcomm:qln1086bd_firmware:-:::::::*
qualcomm	qmp1000_firmware	—	cpe:2.3:o:qualcomm:qmp1000_firmware:-:::::::*
qualcomm	qpa1083bd_firmware	—	cpe:2.3:o:qualcomm:qpa1083bd_firmware:-:::::::*
qualcomm	qpa1086bd_firmware	—	cpe:2.3:o:qualcomm:qpa1086bd_firmware:-:::::::*
qualcomm	qxm1083_firmware	—	cpe:2.3:o:qualcomm:qxm1083_firmware:-:::::::*
qualcomm	qxm1086_firmware	—	cpe:2.3:o:qualcomm:qxm1086_firmware:-:::::::*
qualcomm	qxm1093_firmware	—	cpe:2.3:o:qualcomm:qxm1093_firmware:-:::::::*
qualcomm	qxm1094_firmware	—	cpe:2.3:o:qualcomm:qxm1094_firmware:-:::::::*
qualcomm	qxm1095_firmware	—	cpe:2.3:o:qualcomm:qxm1095_firmware:-:::::::*
qualcomm	qxm1096_firmware	—	cpe:2.3:o:qualcomm:qxm1096_firmware:-:::::::*
qualcomm	sar1165p_firmware	—	cpe:2.3:o:qualcomm:sar1165p_firmware:-:::::::*
qualcomm	sar2130p_firmware	—	cpe:2.3:o:qualcomm:sar2130p_firmware:-:::::::*
qualcomm	sc8380xp_firmware	—	cpe:2.3:o:qualcomm:sc8380xp_firmware:-:::::::*
qualcomm	sm6650p_firmware	—	cpe:2.3:o:qualcomm:sm6650p_firmware:-:::::::*
qualcomm	sm7435_firmware	—	cpe:2.3:o:qualcomm:sm7435_firmware:-:::::::*
qualcomm	sm7635p_firmware	—	cpe:2.3:o:qualcomm:sm7635p_firmware:-:::::::*
qualcomm	sm7675_firmware	—	cpe:2.3:o:qualcomm:sm7675_firmware:-:::::::*
qualcomm	sm7675p_firmware	—	cpe:2.3:o:qualcomm:sm7675p_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	sm8750p_firmware	—	cpe:2.3:o:qualcomm:sm8750p_firmware:-:::::::*
qualcomm	snapdragon_6_gen_1_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_6_gen_1_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_6_gen_3_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_6_gen_3_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_6_gen_4_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_6_gen_4_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_7s_gen_3_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_7s_gen_3_mobile_platform_firmware:-:::::::*
qualcomm	snapdragon_8_elite_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8_elite_firmware:-:::::::*
qualcomm	snapdragon_8_elite_gen_5_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8_elite_gen_5_firmware:-:::::::*
qualcomm	snapdragon_8_gen_3_mobile_platform_firmware	—	cpe:2.3:o:qualcomm:snapdragon_8_gen_3_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_firmware	—	cpe:2.3:o:qualcomm:snapdragon_ar1\+_gen_1_platform_firmware:-:::::::*
qualcomm	snapdragon_x72_5g_modem-rf_system_firmware	—	cpe:2.3:o:qualcomm:snapdragon_x72_5g_modem-rf_system_firmware:-:::::::*
qualcomm	snapdragon_x75_5g_modem-rf_system_firmware	—	cpe:2.3:o:qualcomm:snapdragon_x75_5g_modem-rf_system_firmware:-:::::::*
qualcomm	sxr2230p_firmware	—	cpe:2.3:o:qualcomm:sxr2230p_firmware:-:::::::*
qualcomm	sxr2250p_firmware	—	cpe:2.3:o:qualcomm:sxr2250p_firmware:-:::::::*
qualcomm	sxr2330p_firmware	—	cpe:2.3:o:qualcomm:sxr2330p_firmware:-:::::::*
qualcomm	sxr2350p_firmware	—	cpe:2.3:o:qualcomm:sxr2350p_firmware:-:::::::*
qualcomm	wcd9340_firmware	—	cpe:2.3:o:qualcomm:wcd9340_firmware:-:::::::*
qualcomm	wcd9370_firmware	—	cpe:2.3:o:qualcomm:wcd9370_firmware:-:::::::*
qualcomm	wcd9375_firmware	—	cpe:2.3:o:qualcomm:wcd9375_firmware:-:::::::*
qualcomm	wcd9378_firmware	—	cpe:2.3:o:qualcomm:wcd9378_firmware:-:::::::*
qualcomm	wcd9378c_firmware	—	cpe:2.3:o:qualcomm:wcd9378c_firmware:-:::::::*
qualcomm	wcd9380_firmware	—	cpe:2.3:o:qualcomm:wcd9380_firmware:-:::::::*
qualcomm	wcd9385_firmware	—	cpe:2.3:o:qualcomm:wcd9385_firmware:-:::::::*
qualcomm	wcd9390_firmware	—	cpe:2.3:o:qualcomm:wcd9390_firmware:-:::::::*
qualcomm	wcd9395_firmware	—	cpe:2.3:o:qualcomm:wcd9395_firmware:-:::::::*
qualcomm	wcn3988_firmware	—	cpe:2.3:o:qualcomm:wcn3988_firmware:-:::::::*
qualcomm	wcn6450_firmware	—	cpe:2.3:o:qualcomm:wcn6450_firmware:-:::::::*
qualcomm	wcn6650_firmware	—	cpe:2.3:o:qualcomm:wcn6650_firmware:-:::::::*

References for CVE-2026-21381

URL	Tags
https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html	Vendor Advisory

URL

CVE-2026-21381 | Buffer Over-read in WLAN Firmware

Exploit prediction scoring system (EPSS) score for CVE-2026-21381

Common vulnerability scoring system (CVSS) metrics for CVE-2026-21381

Weakness enumeration for CVE-2026-21381

Affected software / configurations for CVE-2026-21381

References for CVE-2026-21381