CVE-2021-1905 [Exploited] | Qualcomm APQ8009 FIRMWARE Use-After-Free

CVE-2021-1905 is rated Critical Active Threat (80.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.15%). CISA KEV confirms active exploitation (added 2021-11-03) affecting Qualcomm / Multiple Chipsets. a weakness (CWE-416) 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	0.76%	1.15%	+0.39%
2	2026-06-01	0.65%	0.76%	+0.11%
3	2026-04-20	—	0.65%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.76%

1.15%

+0.39%

2026-06-01

0.65%

0.76%

+0.11%

2026-04-20

—

0.65%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.4	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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: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.	2.5	5.9	[email protected]
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: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.	1.8	5.9	[email protected]
7.2	2.0	HIGH	`AV:L/AC:L/Au:N/C:C/I:C/A:C` 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:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	3.9	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.4

3.1

HIGH

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

2.5

5.9

[email protected]

7.8

3.1

HIGH

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

1.8

5.9

[email protected]

7.2

2.0

HIGH

AV:L/AC:L/Au:N/C:C/I:C/A:C 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:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

3.9

10.0

[email protected]

Affected software / configurations for CVE-2021-1905

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	fsm10055_firmware	—	cpe:2.3:o:qualcomm:fsm10055_firmware:-:::::::*
qualcomm	fsm10056_firmware	—	cpe:2.3:o:qualcomm:fsm10056_firmware:-:::::::*
qualcomm	mdm9206_firmware	—	cpe:2.3:o:qualcomm:mdm9206_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	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	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:-:::::::*
qualcomm	pme605_firmware	—	cpe:2.3:o:qualcomm:pme605_firmware:-:::::::*
qualcomm	pmi632_firmware	—	cpe:2.3:o:qualcomm:pmi632_firmware:-:::::::*
qualcomm	pmi8937_firmware	—	cpe:2.3:o:qualcomm:pmi8937_firmware:-:::::::*
qualcomm	pmi8952_firmware	—	cpe:2.3:o:qualcomm:pmi8952_firmware:-:::::::*
qualcomm	pmi8998_firmware	—	cpe:2.3:o:qualcomm:pmi8998_firmware:-:::::::*

References for CVE-2021-1905

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-2021-1905	US Government Resource

URL

CVE-2021-1905

CISA KEV Record for CVE-2021-1905

Exploit prediction scoring system (EPSS) score for CVE-2021-1905

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1905

Weakness enumeration for CVE-2021-1905

Affected software / configurations for CVE-2021-1905

References for CVE-2021-1905