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Vulnerability record · CVE-2017-5447 · published 11 June 2018

CVE-2017-5447: Debian linux use after free vulnerability

Debian · Debian Linux

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.

9.1 CVSS 3.0 Critical EPSS 17% · top 3.0% CWE-416 · Use after free
9.1CVSS 3.0 base score, v2 6.4
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
24References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/97940 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038320 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:1104 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1106 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1201 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1343552 ExploitIssue TrackingVendor Advisory
https://www.debian.org/security/2017/dsa-3831 Third Party Advisory
https://www.exploit-db.com/exploits/42071/ ExploitThird Party AdvisoryVDB Entry
https://www.mozilla.org/security/advisories/mfsa2017-10/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-11/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-12/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-13/ Vendor Advisory
http://www.securityfocus.com/bid/97940 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038320 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:1104 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1106 Third Party Advisory
https://access.redhat.com/errata/RHSA-2017:1201 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1343552 ExploitIssue TrackingVendor Advisory
https://www.debian.org/security/2017/dsa-3831 Third Party Advisory
https://www.exploit-db.com/exploits/42071/ ExploitThird Party AdvisoryVDB Entry
https://www.mozilla.org/security/advisories/mfsa2017-10/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-11/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-12/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-13/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-5447), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.