CVE-2021-1939

Null pointer dereference occurs due to improper validation when the preemption feature enablement is toggled in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Wearables

Published: 2021-09-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-1939 is rated Low Risk (34.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.14%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-1939

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.03% 0.14% +0.10%
2 2025-03-30 0.06% 0.03% -0.03%
3 2025-03-29 — 0.06% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1939

CVSS metrics for this CVE.

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]
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]
4.9 2.0 MEDIUM
AV:L/AC:L/Au:N/C:N/I:N/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:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 6.9 [email protected]

Weakness enumeration for CVE-2021-1939

Affected software / configurations for CVE-2021-1939

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 aqt1000_firmware — cpe:2.3:o:qualcomm:aqt1000_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 qca4020_firmware — cpe:2.3:o:qualcomm:qca4020_firmware:-:*:*:*:*:*:*:*
qualcomm qca6174a_firmware — cpe:2.3:o:qualcomm:qca6174a_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 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 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 qca6595au_firmware — cpe:2.3:o:qualcomm:qca6595au_firmware:-:*:*:*:*:*:*:*
qualcomm qca6696_firmware — cpe:2.3:o:qualcomm:qca6696_firmware:-:*:*:*:*:*:*:*
qualcomm qca9377_firmware — cpe:2.3:o:qualcomm:qca9377_firmware:-:*:*:*:*:*:*:*
qualcomm qca9379_firmware — cpe:2.3:o:qualcomm:qca9379_firmware:-:*:*:*:*:*:*:*
qualcomm qcs603_firmware — cpe:2.3:o:qualcomm:qcs603_firmware:-:*:*:*:*:*:*:*
qualcomm qcs605_firmware — cpe:2.3:o:qualcomm:qcs605_firmware:-:*:*:*:*:*:*:*
qualcomm qet4101_firmware — cpe:2.3:o:qualcomm:qet4101_firmware:-:*:*:*:*:*:*:*
qualcomm qsm8250_firmware — cpe:2.3:o:qualcomm:qsm8250_firmware:-:*:*:*:*:*:*:*
qualcomm qsw8573_firmware — cpe:2.3:o:qualcomm:qsw8573_firmware:-:*:*:*:*:*:*:*
qualcomm qualcomm215_firmware — cpe:2.3:o:qualcomm:qualcomm215_firmware:-:*:*:*:*:*:*:*
qualcomm sa6145p_firmware — cpe:2.3:o:qualcomm:sa6145p_firmware:-:*:*:*:*:*:*:*
qualcomm sa6150p_firmware — cpe:2.3:o:qualcomm:sa6150p_firmware:-:*:*:*:*:*:*:*
qualcomm sa6155_firmware — cpe:2.3:o:qualcomm:sa6155_firmware:-:*:*:*:*:*:*:*
qualcomm sa6155p_firmware — cpe:2.3:o:qualcomm:sa6155p_firmware:-:*:*:*:*:*:*:*
qualcomm sa8145p_firmware — cpe:2.3:o:qualcomm:sa8145p_firmware:-:*:*:*:*:*:*:*
qualcomm sa8150p_firmware — cpe:2.3:o:qualcomm:sa8150p_firmware:-:*:*:*:*:*:*:*
qualcomm sa8155_firmware — cpe:2.3:o:qualcomm:sa8155_firmware:-:*:*:*:*:*:*:*
qualcomm sa8155p_firmware — cpe:2.3:o:qualcomm:sa8155p_firmware:-:*:*:*:*:*:*:*
qualcomm sa8195p_firmware — cpe:2.3:o:qualcomm:sa8195p_firmware:-:*:*:*:*:*:*:*
qualcomm sd_675_firmware — cpe:2.3:o:qualcomm:sd_675_firmware:-:*:*:*:*:*:*:*
qualcomm sd205_firmware — cpe:2.3:o:qualcomm:sd205_firmware:-:*:*:*:*:*:*:*
qualcomm sd210_firmware — cpe:2.3:o:qualcomm:sd210_firmware:-:*:*:*:*:*:*:*
qualcomm sd429_firmware — cpe:2.3:o:qualcomm:sd429_firmware:-:*:*:*:*:*:*:*
qualcomm sd439_firmware — cpe:2.3:o:qualcomm:sd439_firmware:-:*:*:*:*:*:*:*
qualcomm sd450_firmware — cpe:2.3:o:qualcomm:sd450_firmware:-:*:*:*:*:*:*:*
qualcomm sd480_firmware — cpe:2.3:o:qualcomm:sd480_firmware:-:*:*:*:*:*:*:*
qualcomm sd632_firmware — cpe:2.3:o:qualcomm:sd632_firmware:-:*:*:*:*:*:*:*
qualcomm sd665_firmware — cpe:2.3:o:qualcomm:sd665_firmware:-:*:*:*:*:*:*:*
qualcomm sd670_firmware — cpe:2.3:o:qualcomm:sd670_firmware:-:*:*:*:*:*:*:*
qualcomm sd675_firmware — cpe:2.3:o:qualcomm:sd675_firmware:-:*:*:*:*:*:*:*
qualcomm sd678_firmware — cpe:2.3:o:qualcomm:sd678_firmware:-:*:*:*:*:*:*:*
qualcomm sd690_5g_firmware — cpe:2.3:o:qualcomm:sd690_5g_firmware:-:*:*:*:*:*:*:*
qualcomm sd730_firmware — cpe:2.3:o:qualcomm:sd730_firmware:-:*:*:*:*:*:*:*
qualcomm sd750g_firmware — cpe:2.3:o:qualcomm:sd750g_firmware:-:*:*:*:*:*:*:*
qualcomm sd765_firmware — cpe:2.3:o:qualcomm:sd765_firmware:-:*:*:*:*:*:*:*
qualcomm sd765g_firmware — cpe:2.3:o:qualcomm:sd765g_firmware:-:*:*:*:*:*:*:*
qualcomm sd768g_firmware — cpe:2.3:o:qualcomm:sd768g_firmware:-:*:*:*:*:*:*:*
qualcomm sd778g_firmware — cpe:2.3:o:qualcomm:sd778g_firmware:-:*:*:*:*:*:*:*
qualcomm sd780g_firmware — cpe:2.3:o:qualcomm:sd780g_firmware:-:*:*:*:*:*:*:*
qualcomm sd845_firmware — cpe:2.3:o:qualcomm:sd845_firmware:-:*:*:*:*:*:*:*
qualcomm sd855_firmware — cpe:2.3:o:qualcomm:sd855_firmware:-:*:*:*:*:*:*:*
qualcomm sd865_5g_firmware — cpe:2.3:o:qualcomm:sd865_5g_firmware:-:*:*:*:*:*:*:*
qualcomm sd870_firmware — cpe:2.3:o:qualcomm:sd870_firmware:-:*:*:*:*:*:*:*
qualcomm sd888_firmware — cpe:2.3:o:qualcomm:sd888_firmware:-:*:*:*:*:*:*:*
qualcomm sd888_5g_firmware — cpe:2.3:o:qualcomm:sd888_5g_firmware:-:*:*:*:*:*:*:*
qualcomm sda429w_firmware — cpe:2.3:o:qualcomm:sda429w_firmware:-:*:*:*:*:*:*:*
qualcomm sdm429w_firmware — cpe:2.3:o:qualcomm:sdm429w_firmware:-:*:*:*:*:*:*:*
qualcomm sdm830_firmware — cpe:2.3:o:qualcomm:sdm830_firmware:-:*:*:*:*:*:*:*
qualcomm sdx24_firmware — cpe:2.3:o:qualcomm:sdx24_firmware:-:*:*:*:*:*:*:*
qualcomm sdx55_firmware — cpe:2.3:o:qualcomm:sdx55_firmware:-:*:*:*:*:*:*:*
qualcomm sdx55m_firmware — cpe:2.3:o:qualcomm:sdx55m_firmware:-:*:*:*:*:*:*:*
qualcomm sdxr1_firmware — cpe:2.3:o:qualcomm:sdxr1_firmware:-:*:*:*:*:*:*:*
qualcomm sdxr2_5g_firmware — cpe:2.3:o:qualcomm:sdxr2_5g_firmware:-:*:*:*:*:*:*:*
qualcomm sm4125_firmware — cpe:2.3:o:qualcomm:sm4125_firmware:-:*:*:*:*:*:*:*
qualcomm sm7250_firmware — cpe:2.3:o:qualcomm:sm7250_firmware:-:*:*:*:*:*:*:*
qualcomm sm7325_firmware — cpe:2.3:o:qualcomm:sm7325_firmware:-:*:*:*:*:*:*:*
qualcomm wcd9335_firmware — cpe:2.3:o:qualcomm:wcd9335_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-1939

cvelogic Threat Intelligence