CVE-2017-5449 — Mozilla: Crash during bidirectional unicode manipulation with animation (MFSA 2017-11, MFSA 2017-12)

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HIGH

Mozilla: Crash during bidirectional unicode manipulation with animation (MFSA 2017-11, MFSA 2017-12)

Published Jun 11, 2018

7.5

HIGH

CVSS 3.0

EPSS 2.56%

Description

A possibly exploitable crash triggered during layout and manipulation of bidirectional unicode text in concert with CSS animations. This vulnerability affects Thunderbird < 52.1, 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
  <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	<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

2.56% 0.02565

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

EPSS probability 0.02565

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (14 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	2.56% (0.02565)	84.57th	v5 (v2026.06.15)
Jun 15, 2026	2.62% (0.02620)	83.41th	v5 (v2026.06.15)
Feb 18, 2026	1.15% (0.01152)	78.15th	v4 (v2025.03.14)
Mar 30, 2025	2.43% (0.02433)	83.72th	v4 (v2025.03.14)
Mar 29, 2025	5.79% (0.05785)	83.73th	v4 (v2025.03.14)
Mar 17, 2025	2.07% (0.02072)	82.76th	v4 (v2025.03.14)
Dec 12, 2024	0.99% (0.00992)	84.23th	v3 (v2023.03.01)
Nov 2, 2023	0.98% (0.00978)	81.76th	v3 (v2023.03.01)
Sep 3, 2023	1.41% (0.01405)	84.81th	v3 (v2023.03.01)
Mar 7, 2023	1.53% (0.01529)	84.98th	v3 (v2023.03.01)
Mar 6, 2023	1.54% (0.01537)	74.52th	v2 (v2022.01.01)
Feb 4, 2022	1.54% (0.01537)	51.33th	v2 (v2022.01.01)
Feb 3, 2022	2.07% (0.02069)	50.36th	v5 (v2026.06.15)
Apr 14, 2021	2.07% (0.02069)	0.00th	v1

Weaknesses (1)

CWE-20

Improper Input Validation

References (14)

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-2017-5449
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1340127
x_refsource_CONFIRMIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1443311
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2017-5449
https://www.cve.org/CVERecord?id=CVE-2017-5449
https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5449
https://www.mozilla.org/security/advisories/mfsa2017-10/
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-2017-5449		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1340127		x_refsource_CONFIRMIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1443311		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2017-5449
https://www.cve.org/CVERecord?id=CVE-2017-5449
https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5449
https://www.mozilla.org/security/advisories/mfsa2017-10/		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