Which versions of Microsoft are affected by CVE-2019-25598?

Organizations using HeidiSQL Portable 10.1.0.5464 should be aware of moderate risk from CVE-2019-25598, a out-of-bounds write vulnerability rated CVSS 6.2.

Is there a public PoC exploit available for CVE-2019-25598?

Yes, a public proof-of-concept exploit is available for CVE-2019-25598. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2019-25598?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Microsoft CVE-2019-25598

Q: What is the CVSS score of CVE-2019-25598?

CVE-2019-25598 has a CVSS 4.0 base score of 6.9 (Medium). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2019-19938 MEDIUM

Out-of-bounds Write (CWE-787)

2026-03-22 VulnCheck

GHSA-cr7j-gv39-4mc2

Memory Corruption Buffer Overflow Microsoft Denial Of Service

6.9

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

6.9 MEDIUM

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 16, 2026 - 16:22 NVD

6.2 (MEDIUM) 6.9 (MEDIUM)

PoC Detected

Mar 23, 2026 - 14:31 vuln.today

Public exploit code

EUVD ID Assigned

Mar 22, 2026 - 13:45 euvd

EUVD-2019-19938

Analysis Generated

Mar 22, 2026 - 13:45 vuln.today

CVE Published

Mar 22, 2026 - 13:38 nvd

MEDIUM 6.2

CVE Published

Mar 22, 2026 - 13:38 cve.org

MEDIUM 6.9

DescriptionCVE.org

HeidiSQL Portable 10.1.0.5464 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the password field. Attackers can paste a buffer overflow payload into the password input during Microsoft SQL Server login to trigger an application crash.

AnalysisAI

HeidiSQL Portable 10.1.0.5464 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the password field. Rated medium severity (CVSS 6.9), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. HeidiSQL Portable 10.1.0.5464 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the password field. Attackers can paste a buffer overflow payload into the password input during Microsoft SQL Server login to trigger an application crash. Affected products include: Heidisql Heidisql Portable.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).