CVE-2017-5447 — Mozilla: Out-of-bounds read during glyph processing (MFSA 2017-11, MFSA 2017-12)

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CRITICAL

Mozilla: Out-of-bounds read during glyph processing (MFSA 2017-11, MFSA 2017-12)

Published Jun 11, 2018

9.1

CRITICAL

CVSS 3.0

EPSS 17.31%

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.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <53
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <45.9
- Version
  unspecified
  Status
  affected
  Constraints
  <52.1
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <52.1

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
unspecified	affected	<53

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<45.9
unspecified	affected	<52.1

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<52.1

Red Hat Enterprise Linux 6

firefox-0:52.1.0-2.el6_9

Fixed · RHSA-2017:1104
Red Hat Enterprise Linux 6

thunderbird-0:52.1.0-1.el6_9

Fixed · RHSA-2017:1201
Red Hat Enterprise Linux 7

firefox-0:52.1.0-2.el7_3

Fixed · RHSA-2017:1106
Red Hat Enterprise Linux 7

thunderbird-0:52.1.0-1.el7_3

Fixed · RHSA-2017:1201
Red Hat Enterprise Linux 5

firefox

Will not fix
Red Hat Enterprise Linux 5

thunderbird

Will not fix

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:52.1.0-2.el6_9	Fixed	RHSA-2017:1104
Red Hat Enterprise Linux 6	thunderbird-0:52.1.0-1.el6_9	Fixed	RHSA-2017:1201
Red Hat Enterprise Linux 7	firefox-0:52.1.0-2.el7_3	Fixed	RHSA-2017:1106
Red Hat Enterprise Linux 7	thunderbird-0:52.1.0-1.el7_3	Fixed	RHSA-2017:1201
Red Hat Enterprise Linux 5	firefox	Will not fix	n/a
Red Hat Enterprise Linux 5	thunderbird	Will not fix	n/a

Remediation

No remediation recorded yet.

Metrics

17.31% 0.17314

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.17314

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (35 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	17.31% (0.17314)	97.02th	v5 (v2026.06.15)
Sep 22, 2026	17.31% (0.17314)	96.97th	v5 (v2026.06.15)
Sep 21, 2026	12.41% (0.12412)	96.08th	v5 (v2026.06.15)
Sep 6, 2026	17.31% (0.17314)	96.90th	v5 (v2026.06.15)
Sep 5, 2026	12.41% (0.12412)	96.00th	v5 (v2026.06.15)
Aug 30, 2026	17.31% (0.17314)	96.88th	v5 (v2026.06.15)
Aug 28, 2026	12.41% (0.12412)	95.98th	v5 (v2026.06.15)
Aug 24, 2026	17.31% (0.17314)	96.87th	v5 (v2026.06.15)
Aug 23, 2026	12.41% (0.12412)	95.97th	v5 (v2026.06.15)
Jun 15, 2026	17.66% (0.17663)	96.76th	v5 (v2026.06.15)
May 21, 2026	10.98% (0.10983)	93.51th	v4 (v2025.03.14)
Nov 21, 2025	17.85% (0.17854)	94.86th	v4 (v2025.03.14)
Nov 18, 2025	25.32% (0.25319)	95.86th	v4 (v2025.03.14)
Aug 20, 2025	17.85% (0.17854)	94.86th	v4 (v2025.03.14)
Mar 30, 2025	28.26% (0.28261)	96.08th	v4 (v2025.03.14)
Mar 29, 2025	52.18% (0.52179)	96.96th	v4 (v2025.03.14)
Mar 17, 2025	28.63% (0.28625)	96.13th	v4 (v2025.03.14)
Dec 12, 2024	1.79% (0.01786)	88.57th	v3 (v2023.03.01)
Jun 26, 2024	1.55% (0.01553)	87.27th	v3 (v2023.03.01)
May 21, 2024	1.91% (0.01914)	88.56th	v3 (v2023.03.01)
Dec 12, 2023	1.50% (0.01501)	85.45th	v3 (v2023.03.01)
Nov 2, 2023	1.78% (0.01777)	86.67th	v3 (v2023.03.01)
Sep 20, 2023	2.06% (0.02060)	87.68th	v3 (v2023.03.01)
Jul 10, 2023	2.89% (0.02892)	89.34th	v3 (v2023.03.01)
Jun 23, 2023	2.10% (0.02103)	87.56th	v3 (v2023.03.01)
Jun 5, 2023	2.68% (0.02684)	88.92th	v3 (v2023.03.01)
May 3, 2023	2.65% (0.02648)	88.81th	v3 (v2023.03.01)
Mar 7, 2023	2.70% (0.02701)	88.82th	v3 (v2023.03.01)
Mar 6, 2023	18.33% (0.18327)	96.32th	v2 (v2022.01.01)
Apr 1, 2022	18.33% (0.18327)	95.99th	v2 (v2022.01.01)
Feb 4, 2022	18.33% (0.18327)	93.57th	v2 (v2022.01.01)
Feb 3, 2022	10.99% (0.10990)	88.00th	v1
Jan 6, 2022	10.99% (0.10990)	87.86th	v1
Sep 1, 2021	10.99% (0.10990)	95.28th	v1
Apr 14, 2021	10.99% (0.10990)	0.00th	v1

Weaknesses (1)

CWE-416

Use After Free

References (17)

http://www.securityfocus.com/bid/97940
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038320
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:1104
vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2017:1106
vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2017:1201
vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2017-5447
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1343552
x_refsource_CONFIRMExploitIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1443313
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2017-5447
https://www.cve.org/CVERecord?id=CVE-2017-5447
https://www.debian.org/security/2017/dsa-3831
vendor-advisoryx_refsource_DEBIANThird Party Advisory
https://www.exploit-db.com/exploits/42071/
exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5447
https://www.mozilla.org/security/advisories/mfsa2017-10/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-11/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-12/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-13/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/97940		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038320		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2017:1104		vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2017:1106		vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2017:1201		vendor-advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2017-5447		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1343552		x_refsource_CONFIRMExploitIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1443313		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2017-5447
https://www.cve.org/CVERecord?id=CVE-2017-5447
https://www.debian.org/security/2017/dsa-3831		vendor-advisoryx_refsource_DEBIANThird Party Advisory
https://www.exploit-db.com/exploits/42071/		exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5447
https://www.mozilla.org/security/advisories/mfsa2017-10/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-11/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-12/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-13/		x_refsource_CONFIRMVendor Advisory