CVE-2021-1927

Possible use after free due to lack of null check while memory is being freed in FastRPC driver in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

Published: 2021-05-07 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-1927 is rated Low Risk (37.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.04%). 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-2021-1927

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 2025-05-11 0.09% 0.04% -0.05%
2 2025-03-17 0.04% 0.09% +0.05%
3 2023-03-07 — 0.04% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1927

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]
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]

Weakness enumeration for CVE-2021-1927

Affected software / configurations for CVE-2021-1927

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 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 fsm10055_firmware — cpe:2.3:o:qualcomm:fsm10055_firmware:-:*:*:*:*:*:*:*
qualcomm fsm10056_firmware — cpe:2.3:o:qualcomm:fsm10056_firmware:-:*:*:*:*:*:*:*
qualcomm ipq4018_firmware — cpe:2.3:o:qualcomm:ipq4018_firmware:-:*:*:*:*:*:*:*
qualcomm ipq4019_firmware — cpe:2.3:o:qualcomm:ipq4019_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 ipq8065_firmware — cpe:2.3:o:qualcomm:ipq8065_firmware:-:*:*:*:*:*:*:*
qualcomm ipq8068_firmware — cpe:2.3:o:qualcomm:ipq8068_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 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 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:-:*:*:*:*:*:*:*

References for CVE-2021-1927

cvelogic Threat Intelligence