CVE-2020-15663
Reported by mozilla · Published October 1, 2020
If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| firefox | Alpine | 80.0-r0 |
| librewolf | Alpine | 80.0-r0 |
| firefox-esr | Alpine | 78.2.0-r0 |
| firefox | mozilla | 80.0, 80, 78.2 |
| thunderbird | mozilla | 78.2, 68.12 |
| Firefox ESR | Mozilla | 78.2, 68.12 |
| firefox_esr | mozilla | 68.12 |
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | unspecified |
| Mozilla | Thunderbird | unspecified, unspecified |
| Mozilla | Firefox ESR | unspecified, unspecified |
| Mozilla | Firefox | * |
| Mozilla | Firefox ESR | *, * |
| alpine | firefox | 0 |
| alpine | librewolf | 0 |
| alpine | firefox-esr | 0 |
| Mozilla | Thunderbird | *, * |
Timeline
- Aug 26, 2020 CVE Published
- Apr 14, 2021 EPSS Score (30 in total, the first dated here)
- Jun 1, 2026 Security Advisory (6 in total, the first dated here)
- Sep 4, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2020-15663
vulnetix vdb fixes CVE-2020-15663Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2020-15663/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart