CVE-2025-3277

What it actually does

An integer overflow in SQLite’s concat_ws() function causes a truncated value to be used for buffer allocation while the original size is used for the subsequent write, resulting in a ~4GB heap buffer overflow that can enable arbitrary code execution.

Why it matters to the business

Systems relying on the affected SQLite versions face risk of remote code execution, which could lead to data compromise or service disruption; the vulnerability affects widely used database components with moderate and increasing exploit likelihood but no confirmed active campaigns.

How an attack unfolds

An attacker supplies specially crafted input to the concat_ws() function to trigger the integer overflow, resulting in undersized heap allocation followed by an oversized write that corrupts memory and allows arbitrary code execution.

How to fix it

Upgrade SQLite to commit 3cd92ce875fd4e5601e535c35fef33494a6684e3 or later; for listed Red Hat expat packages on rhel_eus 9.4, update to version 0:2.5.0-2.el9_4.2.

How to confirm the fix worked

Confirm installed package versions match the listed fixed releases and test concat_ws() with large concatenated inputs to verify absence of overflow behavior.

Typical attack path

1. Identify applications or services using a vulnerable SQLite version
2. Supply malicious input that reaches the concat_ws() function
3. Trigger the integer overflow to cause undersized buffer allocation
4. Perform oversized write to achieve heap buffer overflow
5. Leverage memory corruption for arbitrary code execution

How to detect it

Review application logs and crash reports for SQLite memory corruption indicators or unusual concat_ws failures; no public exploitation artifacts are known.

What your security team should do

• Apply the listed SQLite and expat updates immediately across all affected environments
• Inventory applications using SQLite to prioritize patching
• Monitor EPSS trend for continued increase in exploit probability