CVE-2021-1931

Possible buffer overflow due to improper validation of buffer length while processing fast boot...

6.7 MediumPublic exploitFix available

Possible buffer overflow due to improper validation of buffer length while processing fast boot commands in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.22%Down 0.2 points since Jul 13, 2021

What each source reports

CVE List Score used 6.7

Record: CVE-2021-1931
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

EUVDEUVD-2021-7395 6.7

Record: EUVD-2021-7395
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-76g8-78xr-pq89 No score

Possible buffer overflow due to improper validation of buffer length while processing fast boot...

Record: GHSA-76g8-78xr-pq89
Weakness: CWE-120
Updated: 2026-11-02

NVD 6.7

Record: CVE-2021-1931
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-120
Updated: 2026-11-02

Affected products

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Affected packages

Affected packages
Package	Affected	Fixed
`abl/tianocore/edk2` Android	SoCVersion:0 up to SoCVersion:2021-07-05, plus listed versions SoCVersion	SoCVersion:2021-07-05

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	FakeShell/CVE-2021-1931-BBRY-KEY2	2025-05-04
PoC in GitHub	aomsin2526/xperia_5_bl_unlocker_poc	2026-07-02
PoC in GitHub	starseed12345/QuestStack	2026-07-31
PoC in GitHub	stanw47/Blackberry-Key2-Research	2026-10-05

History

History
Recorded	Changed	Sources
Nov 5, 2026	exploits, facts	OSV
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-1931 is a medium vulnerability (CVSS 6.7) in Qualcomm, Inc. Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Iot, Snapdragon Industrial Iot, Snapdragon Mobile, Snapdragon Voice & Music, published July 1, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.22%, the 13th percentile. Fixed in abl/tianocore/edk2 SoCVersion:2021-07-05.