Use After Free in Mozilla Firefox
CVE-2017-5447
An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.173 (97.0th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.173 · newest: 0.173 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified, 52.0
- Mozilla Firefox Esr — versions unspecified
- Mozilla Thunderbird — versions unspecified
- Debian Linux — versions 9.0
- Red Hat Enterprise Linux — versions 6.0, 7.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.3, 7.4
- Red Hat Enterprise Linux Server Eus — versions 7.3, 7.4, 7.5
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.exploit-db.com/exploits/42071/ (Exploit, VDB Entry, Third Party Advisory, exploit)
- access.redhat.com/errata/RHSA-2017:1106 (vendor-advisory, Third Party Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2017-12/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2017-11/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2017-10/ (Vendor Advisory)
- www.securityfocus.com/bid/97940 (VDB Entry, Third Party Advisory, vdb-entry)
- www.debian.org/security/2017/dsa-3831 (vendor-advisory, Third Party Advisory)
- www.mozilla.org/security/advisories/mfsa2017-13/ (Vendor Advisory)
- www.securitytracker.com/id/1038320 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2017-5447?
- CVE-2017-5447 is a critical-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 9.1/10. Published 2018-06-11.
- How severe is CVE-2017-5447?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2017-5447 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.