---
cve: "CVE-2025-4918"
severity: "CRITICAL"
cvss: 9.8
epss: "9.4%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2025-05-17 22:15:19"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-01T13:43:43+02:00"
---

# CVE-2025-4918

> 9.8 CRITICAL

## Beschreibung

An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## BSI-Hinweise (deutsch)

- [Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2025-1850)
- [Mozilla Firefox / Thunderbird: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2025-1097)

## Referenzen

- <https://bugzilla.mozilla.org/show_bug.cgi?id=1966612>
- <https://www.mozilla.org/security/advisories/mfsa2025-36/>
- <https://www.mozilla.org/security/advisories/mfsa2025-37/>
- <https://www.mozilla.org/security/advisories/mfsa2025-38/>
- <https://www.mozilla.org/security/advisories/mfsa2025-40/>
- <https://www.mozilla.org/security/advisories/mfsa2025-41/>
- <https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html>
- <https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html>
- <https://www.vicarius.io/vsociety/posts/cve-2025-4918-detect-firefox-out-of-bounds-write>
- <https://www.vicarius.io/vsociety/posts/cve-2025-4918-mitigate-firefox-out-of-bounds-write>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-4918) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_