Use After Free in Mozilla Firefox
CVE-2020-15683
Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.027 (85.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.2% 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
- Debian Linux — versions 9.0, 10.0
- openSUSE Leap — versions 15.1, 15.2
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2020-45/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-47/ (Release Notes, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-46/ (Release Notes, Vendor Advisory)
- bugzilla.mozilla.org/buglist.cgi (Issue Tracking, Broken Link, Vendor Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.html (vendor-advisory, Mailing List, Third Party Advisory)
- www.debian.org/security/2020/dsa-4780 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.html (vendor-advisory, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/10/msg00027.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202010-08 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15683?
- CVE-2020-15683 is a critical-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 9.8/10. Published 2020-10-22.
- How severe is CVE-2020-15683?
- Critical severity. CVSS v3 base score is 9.8 out of 10.