CVE-2017-7825 — Mozilla: OS X fonts render some Tibetan and Arabic unicode characters as spaces (MFSA 2017-22)

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MEDIUM

Mozilla: OS X fonts render some Tibetan and Arabic unicode characters as spaces (MFSA 2017-22)

Published Jun 11, 2018

6.1

MEDIUM

CVSS 3.0

EPSS 1.63%

Description

Several fonts on OS X display some Tibetan and Arabic characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <56
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <52.4
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <52.4

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	<56

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<52.4

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<52.4

Red Hat Enterprise Linux 6

firefox

Not affected
Red Hat Enterprise Linux 6

thunderbird

Not affected
Red Hat Enterprise Linux 7

firefox

Not affected
Red Hat Enterprise Linux 7

thunderbird

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox	Not affected	n/a
Red Hat Enterprise Linux 6	thunderbird	Not affected	n/a
Red Hat Enterprise Linux 7	firefox	Not affected	n/a
Red Hat Enterprise Linux 7	thunderbird	Not affected	n/a

Remediation

No remediation recorded yet.

Metrics

1.63% 0.01629

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

EPSS probability 0.01629

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 (17 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	1.63% (0.01629)	75.31th	v5 (v2026.06.15)
Jun 15, 2026	1.63% (0.01629)	73.00th	v5 (v2026.06.15)
Mar 17, 2025	1.47% (0.01474)	79.62th	v4 (v2025.03.14)
Jul 20, 2024	0.42% (0.00423)	74.51th	v3 (v2023.03.01)
Feb 14, 2024	0.42% (0.00423)	73.62th	v3 (v2023.03.01)
Jan 5, 2024	0.42% (0.00423)	71.61th	v3 (v2023.03.01)
Nov 2, 2023	0.54% (0.00540)	74.74th	v3 (v2023.03.01)
Jun 5, 2023	0.59% (0.00586)	75.07th	v3 (v2023.03.01)
Mar 7, 2023	0.49% (0.00494)	72.49th	v3 (v2023.03.01)
Mar 6, 2023	1.54% (0.01537)	74.52th	v2 (v2022.01.01)
Feb 23, 2023	1.54% (0.01537)	74.48th	v2 (v2022.01.01)
Apr 1, 2022	1.54% (0.01537)	72.41th	v2 (v2022.01.01)
Feb 4, 2022	1.54% (0.01537)	51.33th	v2 (v2022.01.01)
Feb 3, 2022	0.31% (0.00308)	2.76th	v1
Jan 6, 2022	0.31% (0.00308)	2.74th	v1
Sep 1, 2021	0.31% (0.00308)	5.84th	v1
Apr 14, 2021	0.31% (0.00308)	0.00th	v1

Weaknesses (1)

CWE-20

Improper Input Validation

References (14)

http://www.securityfocus.com/bid/101059
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039465
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2017-7825
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1390980
x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1393624
x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1496657
Issue Tracking
https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
mailing-listx_refsource_MLISTThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2017-7825
https://security.gentoo.org/glsa/201803-14
vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2017-7825
https://www.mozilla.org/en-US/security/advisories/mfsa2017-22/#CVE-2017-7825
https://www.mozilla.org/security/advisories/mfsa2017-21/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-22/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-23/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/101059		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039465		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://access.redhat.com/security/cve/CVE-2017-7825		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1390980		x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1393624		x_refsource_CONFIRMIssue TrackingThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1496657		Issue Tracking
https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html		mailing-listx_refsource_MLISTThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2017-7825
https://security.gentoo.org/glsa/201803-14		vendor-advisoryx_refsource_GENTOOThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2017-7825
https://www.mozilla.org/en-US/security/advisories/mfsa2017-22/#CVE-2017-7825
https://www.mozilla.org/security/advisories/mfsa2017-21/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-22/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-23/		x_refsource_CONFIRMVendor Advisory