Is CVE-2017-5402 being actively exploited?

CVE-2017-5402 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2017-5402?

CVE-2017-5402 has a CVSS 3.0 base score of 9.8 (CRITICAL).

CVE-2017-5402

CRITICAL · CVSS 9.8EPSS 2.9%EU EUVD

A use-after-free can occur when events are fired for a "FontFace" object after the object has been already been destroyed while working with fonts. This results in a potentially exploitable crash. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

Key facts

CVSS score: 9.8 (v3.0)
Severity: CRITICAL
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
EPSS score: 2.9% (87th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2017-14506)
Published: June 11, 2018
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-14506 in the EU Vulnerability Database. Last updated in EUVD on August 5, 2024.

View on the EU Vulnerability Database

Affected products

debian / debian linux
mozilla / firefox
mozilla / thunderbird
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server eus
redhat / enterprise linux server eus
redhat / enterprise linux server eus
redhat / enterprise linux workstation
redhat / enterprise linux workstation
redhat / enterprise linux workstation

Certified products that may be affected

7 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux libgcrypt Cryptographic Module v4.0 [1] and Red Hat Enterprise Linux libgcrypt Cryptographic Module v5.0 [2] - Red Hat®, Inc. - FIPS 140 2657 - historical
Red Hat Enterprise Linux 5 OpenSSH-Server Cryptographic Module - Red Hat®, Inc. - FIPS 140 1384 - historical
Red Hat Enterprise Linux 5 OpenSSH Client Cryptographic Module - Red Hat®, Inc. - FIPS 140 1385 - historical
Red Hat Enterprise Linux 5 OpenSwan Cryptographic Module - Red Hat®, Inc. - FIPS 140 1386 - historical
Red Hat Enterprise Linux 5 Kernel Crypto API Cryptographic Module - Red Hat®, Inc. - FIPS 140 1387 - historical

See all 7 in the Security Certifications Explorer.

References

http://rhn.redhat.com/errata/RHSA-2017-0459.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2017-0461.html(Third Party Advisory)
http://rhn.redhat.com/errata/RHSA-2017-0498.html(Third Party Advisory)
http://www.securityfocus.com/bid/96664(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1037966(Third Party Advisory, VDB Entry)
https://bugzilla.mozilla.org/show_bug.cgi?id=1334876(Issue Tracking, Patch, Vendor Advisory)
https://security.gentoo.org/glsa/201705-06(Third Party Advisory)
https://security.gentoo.org/glsa/201705-07(Third Party Advisory)
https://www.debian.org/security/2017/dsa-3805(Third Party Advisory)
https://www.debian.org/security/2017/dsa-3832(Third Party Advisory)
https://www.mozilla.org/security/advisories/mfsa2017-05/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2017-06/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2017-07/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2017-09/(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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