CVE-2021-1906 [Exploited] | Qualcomm APQ8009 FIRMWARE

CVE-2021-1906 is rated Active Exploitation (70/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.52%). CISA KEV confirms active exploitation (added 2021-11-03) affecting Qualcomm / Multiple Chipsets. Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.15%	0.52%	+0.37%
2	2025-12-27	0.21%	0.15%	-0.06%
3	2025-11-21	—	0.21%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.15%

0.52%

+0.37%

2025-12-27

0.21%

0.15%

-0.06%

2025-11-21

—

0.21%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.2	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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.	2.5	3.6	[email protected]
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) A normal user session is enough; they don’t have to be admin. 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.	1.8	3.6	[email protected]
2.1	2.0	LOW	`AV:L/AC:L/Au:N/C:N/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:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	3.9	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.2

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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.

2.5

3.6

[email protected]

5.5

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): A normal user session is enough; they don’t have to be admin.
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.

1.8

3.6

[email protected]

2.1

2.0

LOW

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

3.9

2.9

[email protected]

Affected software / configurations for CVE-2021-1906

Vendor	Product	Version	Raw CPE
qualcomm	apq8009_firmware	—	cpe:2.3:o:qualcomm:apq8009_firmware:-:::::::*
qualcomm	apq8009w_firmware	—	cpe:2.3:o:qualcomm:apq8009w_firmware:-:::::::*
qualcomm	apq8017_firmware	—	cpe:2.3:o:qualcomm:apq8017_firmware:-:::::::*
qualcomm	apq8053_firmware	—	cpe:2.3:o:qualcomm:apq8053_firmware:-:::::::*
qualcomm	apq8064au_firmware	—	cpe:2.3:o:qualcomm:apq8064au_firmware:-:::::::*
qualcomm	apq8096au_firmware	—	cpe:2.3:o:qualcomm:apq8096au_firmware:-:::::::*
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	ar8151_firmware	—	cpe:2.3:o:qualcomm:ar8151_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	fsm10055_firmware	—	cpe:2.3:o:qualcomm:fsm10055_firmware:-:::::::*
qualcomm	fsm10056_firmware	—	cpe:2.3:o:qualcomm:fsm10056_firmware:-:::::::*
qualcomm	mdm9150_firmware	—	cpe:2.3:o:qualcomm:mdm9150_firmware:-:::::::*
qualcomm	mdm9206_firmware	—	cpe:2.3:o:qualcomm:mdm9206_firmware:-:::::::*
qualcomm	mdm9250_firmware	—	cpe:2.3:o:qualcomm:mdm9250_firmware:-:::::::*
qualcomm	mdm9607_firmware	—	cpe:2.3:o:qualcomm:mdm9607_firmware:-:::::::*
qualcomm	mdm9626_firmware	—	cpe:2.3:o:qualcomm:mdm9626_firmware:-:::::::*
qualcomm	mdm9628_firmware	—	cpe:2.3:o:qualcomm:mdm9628_firmware:-:::::::*
qualcomm	mdm9650_firmware	—	cpe:2.3:o:qualcomm:mdm9650_firmware:-:::::::*
qualcomm	msm8909w_firmware	—	cpe:2.3:o:qualcomm:msm8909w_firmware:-:::::::*
qualcomm	msm8917_firmware	—	cpe:2.3:o:qualcomm:msm8917_firmware:-:::::::*
qualcomm	msm8953_firmware	—	cpe:2.3:o:qualcomm:msm8953_firmware:-:::::::*
qualcomm	msm8996au_firmware	—	cpe:2.3:o:qualcomm:msm8996au_firmware:-:::::::*
qualcomm	pm215_firmware	—	cpe:2.3:o:qualcomm:pm215_firmware:-:::::::*
qualcomm	pm3003a_firmware	—	cpe:2.3:o:qualcomm:pm3003a_firmware:-:::::::*
qualcomm	pm4125_firmware	—	cpe:2.3:o:qualcomm:pm4125_firmware:-:::::::*
qualcomm	pm4250_firmware	—	cpe:2.3:o:qualcomm:pm4250_firmware:-:::::::*
qualcomm	pm439_firmware	—	cpe:2.3:o:qualcomm:pm439_firmware:-:::::::*
qualcomm	pm456_firmware	—	cpe:2.3:o:qualcomm:pm456_firmware:-:::::::*
qualcomm	pm6125_firmware	—	cpe:2.3:o:qualcomm:pm6125_firmware:-:::::::*
qualcomm	pm6150_firmware	—	cpe:2.3:o:qualcomm:pm6150_firmware:-:::::::*
qualcomm	pm6150a_firmware	—	cpe:2.3:o:qualcomm:pm6150a_firmware:-:::::::*
qualcomm	pm6150l_firmware	—	cpe:2.3:o:qualcomm:pm6150l_firmware:-:::::::*
qualcomm	pm6250_firmware	—	cpe:2.3:o:qualcomm:pm6250_firmware:-:::::::*
qualcomm	pm6350_firmware	—	cpe:2.3:o:qualcomm:pm6350_firmware:-:::::::*
qualcomm	pm640a_firmware	—	cpe:2.3:o:qualcomm:pm640a_firmware:-:::::::*
qualcomm	pm640l_firmware	—	cpe:2.3:o:qualcomm:pm640l_firmware:-:::::::*
qualcomm	pm640p_firmware	—	cpe:2.3:o:qualcomm:pm640p_firmware:-:::::::*
qualcomm	pm660_firmware	—	cpe:2.3:o:qualcomm:pm660_firmware:-:::::::*
qualcomm	pm660a_firmware	—	cpe:2.3:o:qualcomm:pm660a_firmware:-:::::::*
qualcomm	pm660l_firmware	—	cpe:2.3:o:qualcomm:pm660l_firmware:-:::::::*
qualcomm	pm670_firmware	—	cpe:2.3:o:qualcomm:pm670_firmware:-:::::::*
qualcomm	pm670a_firmware	—	cpe:2.3:o:qualcomm:pm670a_firmware:-:::::::*
qualcomm	pm670l_firmware	—	cpe:2.3:o:qualcomm:pm670l_firmware:-:::::::*
qualcomm	pm7150a_firmware	—	cpe:2.3:o:qualcomm:pm7150a_firmware:-:::::::*
qualcomm	pm7150l_firmware	—	cpe:2.3:o:qualcomm:pm7150l_firmware:-:::::::*
qualcomm	pm7250_firmware	—	cpe:2.3:o:qualcomm:pm7250_firmware:-:::::::*
qualcomm	pm7250b_firmware	—	cpe:2.3:o:qualcomm:pm7250b_firmware:-:::::::*
qualcomm	pm7350c_firmware	—	cpe:2.3:o:qualcomm:pm7350c_firmware:-:::::::*
qualcomm	pm8004_firmware	—	cpe:2.3:o:qualcomm:pm8004_firmware:-:::::::*
qualcomm	pm8005_firmware	—	cpe:2.3:o:qualcomm:pm8005_firmware:-:::::::*
qualcomm	pm8008_firmware	—	cpe:2.3:o:qualcomm:pm8008_firmware:-:::::::*
qualcomm	pm8009_firmware	—	cpe:2.3:o:qualcomm:pm8009_firmware:-:::::::*
qualcomm	pm8150_firmware	—	cpe:2.3:o:qualcomm:pm8150_firmware:-:::::::*
qualcomm	pm8150a_firmware	—	cpe:2.3:o:qualcomm:pm8150a_firmware:-:::::::*
qualcomm	pm8150b_firmware	—	cpe:2.3:o:qualcomm:pm8150b_firmware:-:::::::*
qualcomm	pm8150c_firmware	—	cpe:2.3:o:qualcomm:pm8150c_firmware:-:::::::*
qualcomm	pm8150l_firmware	—	cpe:2.3:o:qualcomm:pm8150l_firmware:-:::::::*
qualcomm	pm8250_firmware	—	cpe:2.3:o:qualcomm:pm8250_firmware:-:::::::*
qualcomm	pm8350_firmware	—	cpe:2.3:o:qualcomm:pm8350_firmware:-:::::::*
qualcomm	pm8350b_firmware	—	cpe:2.3:o:qualcomm:pm8350b_firmware:-:::::::*
qualcomm	pm8350bh_firmware	—	cpe:2.3:o:qualcomm:pm8350bh_firmware:-:::::::*
qualcomm	pm8350bhs_firmware	—	cpe:2.3:o:qualcomm:pm8350bhs_firmware:-:::::::*
qualcomm	pm8350c_firmware	—	cpe:2.3:o:qualcomm:pm8350c_firmware:-:::::::*
qualcomm	pm855_firmware	—	cpe:2.3:o:qualcomm:pm855_firmware:-:::::::*
qualcomm	pm855a_firmware	—	cpe:2.3:o:qualcomm:pm855a_firmware:-:::::::*
qualcomm	pm855b_firmware	—	cpe:2.3:o:qualcomm:pm855b_firmware:-:::::::*
qualcomm	pm855l_firmware	—	cpe:2.3:o:qualcomm:pm855l_firmware:-:::::::*
qualcomm	pm855p_firmware	—	cpe:2.3:o:qualcomm:pm855p_firmware:-:::::::*
qualcomm	pm8909_firmware	—	cpe:2.3:o:qualcomm:pm8909_firmware:-:::::::*
qualcomm	pm8916_firmware	—	cpe:2.3:o:qualcomm:pm8916_firmware:-:::::::*
qualcomm	pm8937_firmware	—	cpe:2.3:o:qualcomm:pm8937_firmware:-:::::::*
qualcomm	pm8953_firmware	—	cpe:2.3:o:qualcomm:pm8953_firmware:-:::::::*
qualcomm	pm8998_firmware	—	cpe:2.3:o:qualcomm:pm8998_firmware:-:::::::*
qualcomm	pmc1000h_firmware	—	cpe:2.3:o:qualcomm:pmc1000h_firmware:-:::::::*
qualcomm	pmd9607_firmware	—	cpe:2.3:o:qualcomm:pmd9607_firmware:-:::::::*
qualcomm	pmd9655_firmware	—	cpe:2.3:o:qualcomm:pmd9655_firmware:-:::::::*

References for CVE-2021-1906

URL	Tags
https://www.qualcomm.com/company/product-security/bulletins/may-2021-bulletin	Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1906	US Government Resource

URL

CVE-2021-1906

CISA KEV Record for CVE-2021-1906

Exploit prediction scoring system (EPSS) score for CVE-2021-1906

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1906

Weakness enumeration for CVE-2021-1906

Affected software / configurations for CVE-2021-1906

References for CVE-2021-1906