---
cve: "CVE-2020-12387"
severity: "HIGH"
cvss: 8.1
epss: "28.5%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2020-05-26 18:15:10"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T08:21:56+02:00"
---

# CVE-2020-12387

> 8.1 HIGH

## Beschreibung

A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

## CVSS-Vektor

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

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

## Referenzen

- <https://bugzilla.mozilla.org/show_bug.cgi?id=1545345>
- <https://security.gentoo.org/glsa/202005-03>
- <https://security.gentoo.org/glsa/202005-04>
- <https://usn.ubuntu.com/4373-1/>
- <https://www.mozilla.org/security/advisories/mfsa2020-16/>
- <https://www.mozilla.org/security/advisories/mfsa2020-17/>
- <https://www.mozilla.org/security/advisories/mfsa2020-18/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2020-12387) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_