CVE-2021-1903 [Medium] | Denial of Service in Aqt1000 Firmware

Possible denial of service scenario can occur due to lack of length check on Channel Switch Announcement IE in beacon or probe response frame in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wired Infrastructure and Networking

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-04-04	0.30%	0.22%	-0.08%
2	2025-03-30	0.47%	0.30%	-0.17%
3	2025-03-29	—	0.47%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-04-04

0.30%

0.22%

-0.08%

2025-03-30

0.47%

0.30%

-0.17%

2025-03-29

—

0.47%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.3	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L` 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:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	1.4	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.3

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

1.4

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/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:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

2.9

[email protected]

Affected software / configurations for CVE-2021-1903

Vendor	Product	Version	Raw CPE
qualcomm	aqt1000_firmware	—	cpe:2.3:o:qualcomm:aqt1000_firmware:-:::::::*
qualcomm	ar8031_firmware	—	cpe:2.3:o:qualcomm:ar8031_firmware:-:::::::*
qualcomm	ar8035_firmware	—	cpe:2.3:o:qualcomm:ar8035_firmware:-:::::::*
qualcomm	ar9380_firmware	—	cpe:2.3:o:qualcomm:ar9380_firmware:-:::::::*
qualcomm	csr8811_firmware	—	cpe:2.3:o:qualcomm:csr8811_firmware:-:::::::*
qualcomm	csra6620_firmware	—	cpe:2.3:o:qualcomm:csra6620_firmware:-:::::::*
qualcomm	csra6640_firmware	—	cpe:2.3:o:qualcomm:csra6640_firmware:-:::::::*
qualcomm	csrb31024_firmware	—	cpe:2.3:o:qualcomm:csrb31024_firmware:-:::::::*
qualcomm	ipq4018_firmware	—	cpe:2.3:o:qualcomm:ipq4018_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	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	pmp8074_firmware	—	cpe:2.3:o:qualcomm:pmp8074_firmware:-:::::::*
qualcomm	qca1062_firmware	—	cpe:2.3:o:qualcomm:qca1062_firmware:-:::::::*
qualcomm	qca1064_firmware	—	cpe:2.3:o:qualcomm:qca1064_firmware:-:::::::*
qualcomm	qca10901_firmware	—	cpe:2.3:o:qualcomm:qca10901_firmware:-:::::::*
qualcomm	qca2062_firmware	—	cpe:2.3:o:qualcomm:qca2062_firmware:-:::::::*
qualcomm	qca2064_firmware	—	cpe:2.3:o:qualcomm:qca2064_firmware:-:::::::*
qualcomm	qca2065_firmware	—	cpe:2.3:o:qualcomm:qca2065_firmware:-:::::::*
qualcomm	qca2066_firmware	—	cpe:2.3:o:qualcomm:qca2066_firmware:-:::::::*
qualcomm	qca4024_firmware	—	cpe:2.3:o:qualcomm:qca4024_firmware:-:::::::*
qualcomm	qca6175a_firmware	—	cpe:2.3:o:qualcomm:qca6175a_firmware:-:::::::*
qualcomm	qca6310_firmware	—	cpe:2.3:o:qualcomm:qca6310_firmware:-:::::::*
qualcomm	qca6335_firmware	—	cpe:2.3:o:qualcomm:qca6335_firmware:-:::::::*
qualcomm	qca6390_firmware	—	cpe:2.3:o:qualcomm:qca6390_firmware:-:::::::*
qualcomm	qca6391_firmware	—	cpe:2.3:o:qualcomm:qca6391_firmware:-:::::::*
qualcomm	qca6420_firmware	—	cpe:2.3:o:qualcomm:qca6420_firmware:-:::::::*
qualcomm	qca6421_firmware	—	cpe:2.3:o:qualcomm:qca6421_firmware:-:::::::*
qualcomm	qca6426_firmware	—	cpe:2.3:o:qualcomm:qca6426_firmware:-:::::::*
qualcomm	qca6428_firmware	—	cpe:2.3:o:qualcomm:qca6428_firmware:-:::::::*
qualcomm	qca6430_firmware	—	cpe:2.3:o:qualcomm:qca6430_firmware:-:::::::*
qualcomm	qca6431_firmware	—	cpe:2.3:o:qualcomm:qca6431_firmware:-:::::::*
qualcomm	qca6436_firmware	—	cpe:2.3:o:qualcomm:qca6436_firmware:-:::::::*
qualcomm	qca6438_firmware	—	cpe:2.3:o:qualcomm:qca6438_firmware:-:::::::*
qualcomm	qca6564a_firmware	—	cpe:2.3:o:qualcomm:qca6564a_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	qca6696_firmware	—	cpe:2.3:o:qualcomm:qca6696_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	qca8337_firmware	—	cpe:2.3:o:qualcomm:qca8337_firmware:-:::::::*
qualcomm	qca9888_firmware	—	cpe:2.3:o:qualcomm:qca9888_firmware:-:::::::*
qualcomm	qca9889_firmware	—	cpe:2.3:o:qualcomm:qca9889_firmware:-:::::::*
qualcomm	qca9898_firmware	—	cpe:2.3:o:qualcomm:qca9898_firmware:-:::::::*
qualcomm	qca9980_firmware	—	cpe:2.3:o:qualcomm:qca9980_firmware:-:::::::*
qualcomm	qca9984_firmware	—	cpe:2.3:o:qualcomm:qca9984_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	qcm2290_firmware	—	cpe:2.3:o:qualcomm:qcm2290_firmware:-:::::::*
qualcomm	qcm6125_firmware	—	cpe:2.3:o:qualcomm:qcm6125_firmware:-:::::::*
qualcomm	qcm6490_firmware	—	cpe:2.3:o:qualcomm:qcm6490_firmware:-:::::::*

References for CVE-2021-1903

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

URL

CVE-2021-1903

Exploit prediction scoring system (EPSS) score for CVE-2021-1903

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1903

Weakness enumeration for CVE-2021-1903

Affected software / configurations for CVE-2021-1903

References for CVE-2021-1903