Vulnerability in Mozilla Firefox
CVE-2020-15655
A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin information. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.015 (73.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: +0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
- Canonical Ubuntu Linux — versions 16.04, 18.04, 20.04
- openSUSE Leap — versions 15.2
References
- www.mozilla.org/security/advisories/mfsa2020-30/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-32/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-33/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html (vendor-advisory, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4443-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15655?
- CVE-2020-15655 is a medium-severity vulnerability in Mozilla Firefox. CVSS score: 6.5/10. Published 2020-08-10.
- How severe is CVE-2020-15655?
- Medium severity. CVSS v3 base score is 6.5 out of 10.