What is the CVSS score of CVE-2026-21385?

CVE-2026-21385 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.4%.

Is there a public PoC exploit available for CVE-2026-21385?

Yes, a public proof-of-concept exploit is available for CVE-2026-21385. Prioritise patching immediately. EPSS: 0.4%.

How to fix or mitigate CVE-2026-21385?

Within 24 hours: Inventory all affected systems and assess exposure in production environments. Within 7 days: Deploy available vendor patch to all critical and high-priority systems; establish change management approval if not already expedited for critical vulnerabilities. Within 30 days: Complete patching of all remaining systems including development, testing, and lower-priority infrastructure; validate patch effectiveness through security testing.

5g Fixed Wireless Access Platform Firmware CVE-2026-21385

HIGH

Integer Overflow or Wraparound (CWE-190)

2026-03-02 product-security@qualcomm.com

7.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Local access to system
Delivery

Craft malicious input with misaligned memory allocation
Exploit

Trigger integer overflow in alignment calculation
Execution

Corrupt heap metadata
Impact

Execute arbitrary code with elevated privileges

Vulnerability Assessment

Weakness	CWE CWE-190 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Integer overflow checks MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Local user account access required. Vulnerability exploitable through memory allocation routines using custom alignment parameters. Requires ability to invoke vulnerable allocation functions with crafted alignment values on affected system.
Impact	CVSS 7.8 (High). KEV-listed — actively exploited. Patch available. Requires local access/malicious app. Firmware-level vulnerability — very low-level access. Qualcomm chipsets power billions of Android devices.
Exploit ScenarioDerived	A malicious app installed on an Android device with a vulnerable Qualcomm chipset triggers the integer overflow in the kernel driver by making specific system calls with crafted alignment parameters. The resulting memory corruption is exploited to gain kernel-level code execution, bypassing Android's app sandbox and SELinux policies. This enables: data exfiltration of any app's data, persistent rootkit installation, covert surveillance (microphone, camera, location), and credential theft.

Act Now Prioritize within 24-48h. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

A Qualcomm chipset vulnerability (CVE-2026-21385) causes memory corruption through improper integer handling during memory allocation, enabling local privilege escalation to kernel level. KEV-listed and patched, this vulnerability affects Qualcomm-based mobile devices and embedded systems, potentially impacting billions of Android devices globally.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 7.8

Qualcomm chipset firmware contains an integer overflow vulnerability (CWE-190) in memory alignment calculations that leads to memory corruption and local privilege escalation.

RemediationAI

Apply Android security patch level update. OEM firmware updates may be required. Ensure devices receive regular security updates. For enterprise: enforce minimum security patch level via MDM. For high-risk users: verify device patch status.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability occurs in Qualcomm's proprietary firmware during memory allocation where alignment calculations use integer arithmetic that can overflow. This results in undersized memory allocations that are subsequently written beyond their bounds. Because this occurs at the firmware/kernel driver level, successful exploitation provides kernel-level access on affected devices.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Mar 04, 2026 - 18:13 cisa

CISA KEV

PoC Detected

Mar 04, 2026 - 18:13 vuln.today

Public exploit code

Patch released

Mar 04, 2026 - 18:13 nvd

Patch available

CVE Published

Mar 02, 2026 - 17:16 nvd

HIGH 7.8

DescriptionCVE.org

Memory corruption while using alignments for memory allocation.

Articles & Coverage 1

POC CVE-2026-21385: Qualcomm Display Integer Overflow Scanner POC Mar 22, 2026

Executive ViewAI

Why It Matters

CVE-2026-21385 is a memory corruption vulnerability actively exploited in the wild, affecting systems using vulnerable memory allocation functions. This HIGH severity issue poses immediate risk to organizational data confidentiality, integrity, and system availability, requiring urgent patching to prevent potential breaches and service disruptions.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.4%

Top 41% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

CISA KEV

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC Yes

EPSS 0.4%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Small

Automatable· derived

Human Impact

High

Priority Score

109

Low Medium High Critical

KEV: +50

EPSS: 0

CVSS: +39

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.