CVE-2023-42917 — A memory corruption vulnerability was addressed with improved locking.¶

Key facts

CVE-2023-42917 is a High (8.8) vulnerability: A memory corruption vulnerability was addressed with improved locking.. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-12-04), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2023-42917 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-12-04), confirming exploitation in the wild. Federal remediation deadline: 2023-12-25. Prioritise patching and deploy the detection and prevention rules below.


CVE	CVE-2023-42917
Severity	High (8.8)
CISA KEV	Actively exploited (added 2023-12-04)
Detection / prevention	—
PoC	poc.py
Source	2023/CVE-2023-42917/

Details¶

English | 한국어

Description¶

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in iOS 17.1.2 and iPadOS 17.1.2, macOS Sonoma 14.1.2, Safari 17.1.2. Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited against versions of iOS before iOS 16.7.1.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2023-42917
Type	RCE
CVSS Score	8.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2023/CVE-2023-42917/poc.py

Usage¶

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab¶

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start¶

# Clone and navigate to CVE directory
cd CVE-2023-42917

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints¶

Application	URL	Status
Vulnerable App	http://localhost:8080	Shows vulnerability
Patched App	http://localhost:8081	Demonstrates fix

Directory Structure¶

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References¶

http://seclists.org/fulldisclosure/2023/Dec/12
http://seclists.org/fulldisclosure/2023/Dec/13
http://seclists.org/fulldisclosure/2023/Dec/3
http://seclists.org/fulldisclosure/2023/Dec/4
http://seclists.org/fulldisclosure/2023/Dec/5
http://seclists.org/fulldisclosure/2023/Dec/8
http://seclists.org/fulldisclosure/2024/Jan/35
http://www.openwall.com/lists/oss-security/2023/12/05/1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AD2KIHHCUBQC2YYH3FJWAHI5BG3QETOH/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P5LQS6VEI7VIZNC7QGQ62EOV45R5RJIR/
https://security.gentoo.org/glsa/202401-04
https://support.apple.com/en-us/HT214031
https://support.apple.com/en-us/HT214032
https://support.apple.com/en-us/HT214033
https://support.apple.com/kb/HT214033
https://support.apple.com/kb/HT214034
https://support.apple.com/kb/HT214062
https://www.debian.org/security/2023/dsa-5575
http://seclists.org/fulldisclosure/2023/Dec/12
http://seclists.org/fulldisclosure/2023/Dec/13
http://seclists.org/fulldisclosure/2023/Dec/3
http://seclists.org/fulldisclosure/2023/Dec/4
http://seclists.org/fulldisclosure/2023/Dec/5
http://seclists.org/fulldisclosure/2023/Dec/8
http://seclists.org/fulldisclosure/2024/Jan/35
http://www.openwall.com/lists/oss-security/2023/12/05/1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AD2KIHHCUBQC2YYH3FJWAHI5BG3QETOH/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/P5LQS6VEI7VIZNC7QGQ62EOV45R5RJIR/
https://security.gentoo.org/glsa/202401-04
https://support.apple.com/en-us/HT214031
https://support.apple.com/en-us/HT214032
https://support.apple.com/en-us/HT214033
https://support.apple.com/kb/HT214033
https://support.apple.com/kb/HT214034
https://support.apple.com/kb/HT214062
https://www.debian.org/security/2023/dsa-5575
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-42917

Generated by PoC Generator on 2026-07-09T05:28:12.409229378

Frequently asked questions¶

What is CVE-2023-42917?¶

CVE-2023-42917 is a High (8.8) vulnerability: A memory corruption vulnerability was addressed with improved locking.. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-12-04), confirming active exploitation in the wild.

How do I detect CVE-2023-42917?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2023-42917?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2023-42917 actively exploited?¶

Yes. CVE-2023-42917 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2023-12-04, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2023-12-25. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.