CVE-2023-51257 – CVE-2023-51257 is an invalid memory write vulne... (How to Fix)

Q: What is the severity of CVE-2023-51257?

CVE-2023-51257 has a CVSS score of 7.8 (HIGH). CVE-2023-51257 is an invalid memory write vulnerability in Jasper-Software Jasper v4.1.1 and earlier that allows local attackers to execute arbitrary code. This affects systems running vulnerable versions of Jasper software where an attacker has local access.

📋 TL;DR

CVE-2023-51257 is an invalid memory write vulnerability in Jasper-Software Jasper v4.1.1 and earlier that allows local attackers to execute arbitrary code. This affects systems running vulnerable versions of Jasper software where an attacker has local access.

💻 Affected Systems

Products:

Jasper-Software Jasper

Versions: v4.1.1 and earlier

Operating Systems: Linux, Windows, Other platforms running Jasper

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations of affected versions are vulnerable. The vulnerability is in the core Jasper software.

📦 What is this software?

Jasper by Jasper Project

View all CVEs affecting Jasper →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise via arbitrary code execution with the privileges of the Jasper process, potentially leading to data theft, system manipulation, or persistence.

🟠

Likely Case

Local privilege escalation or unauthorized code execution within the context of the Jasper application, potentially affecting system integrity.

🟢

If Mitigated

Limited impact if proper access controls restrict local user privileges and Jasper runs with minimal permissions.

🌐 Internet-Facing: LOW - This vulnerability requires local access to exploit.

🏢 Internal Only: MEDIUM - Internal users with local access could exploit this, but requires specific conditions and access.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires local access and knowledge of memory corruption techniques. No public exploit code has been identified.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: v4.1.2 or later

Vendor Advisory: https://github.com/jasper-software/jasper/issues/367

Restart Required: Yes

Instructions:

1. Check current Jasper version. 2. Download and install Jasper v4.1.2 or later from official sources. 3. Restart any Jasper services or applications. 4. Verify the update was successful.

🔧 Temporary Workarounds

Restrict local access

all

Limit local user access to systems running Jasper to trusted users only

Run Jasper with minimal privileges

linux

Configure Jasper to run with reduced user privileges to limit impact if exploited

sudo chown -R lowprivuser:lowprivgroup /path/to/jasper
sudo -u lowprivuser jasper_command

🧯 If You Can't Patch

Isolate Jasper systems from general user access
Implement strict access controls and monitoring for Jasper processes

🔍 How to Verify

Check if Vulnerable:

Check Jasper version using 'jasper --version' or examine installed package version

Check Version:

jasper --version

Verify Fix Applied:

Confirm version is v4.1.2 or later and test basic Jasper functionality

📡 Detection & Monitoring

Log Indicators:

Unexpected Jasper process crashes
Memory access violation errors in Jasper logs
Unusual process activity from Jasper executable

Network Indicators:

None - this is a local vulnerability

SIEM Query:

Process:Name='jasper' AND (EventID='1000' OR EventID='1001') OR Memory:AccessViolation AND Process:Name='jasper'

📊 Metadata

CVE ID: CVE-2023-51257

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-119

Published: January 16, 2024

Last Updated: November 4, 2025

🔗 References

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