Vulnerability in Mozilla Firefox
CVE-2020-15663
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.027 (85.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.mozilla.org/security/advisories/mfsa2020-41/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-36/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-38/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-40/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-37/ (Release Notes, Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-15663?
- CVE-2020-15663 is a high-severity vulnerability in Mozilla Firefox, classified under Uncontrolled Search Path Element. CVSS score: 8.8/10. Published 2020-10-01.
- How severe is CVE-2020-15663?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-15663 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.