CVE-2017-5436

An out-of-bounds write in the Graphite 2 library triggered with a maliciously crafted Graphite font. This results in a potentially exploitable crash. This issue was fixed in the Graphite 2 library as well as Mozilla products. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Published: 2018-06-11 Last update: 2025-11-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-5436 is rated Moderate Risk (58.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.56%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-5436

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-17 1.05% 0.56% -0.49%
2 2025-11-21 1.24% 1.05% -0.19%
3 2025-11-18 — 1.24% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-5436

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2017-5436

OS Trackers for CVE-2017-5436

vendor priority summary link
debian not yet assigned CVE-2017-5436 not yet assigned priority: Debian including 2 source packages (firefox, firefox-esr), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2017-5436
gentoo high CVE-2017-5436: 2 GLSA(s) (201706-25, 201802-03), 3 atom(s) (media-gfx/graphite2, www-client/firefox, www-client/firefox-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-5436
redhat critical — https://access.redhat.com/security/cve/CVE-2017-5436
suse medium CVE-2017-5436 severity moderate: SUSE including 420 source package names (MozillaFirefox, MozillaFirefox-102.11.0-150200.152.87.1, …), 855 product×package rows across 103 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-Basic-On-Demand, … (103 product lines)): Fixed 590, Known Affected 231, Known Not Affected 34. https://www.suse.com/security/cve/CVE-2017-5436/
ubuntu medium CVE-2017-5436 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 12 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 10, ignored 2. https://ubuntu.com/security/CVE-2017-5436

Affected software / configurations for CVE-2017-5436

Vendor Product Version Raw CPE
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 6.0 cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 6.0 cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.3 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.4 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.5 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 6.0 cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
sil graphite2 — cpe:2.3:a:sil:graphite2:-:*:*:*:*:*:*:*
mozilla firefox < 45.9.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox < 53.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox 52.0 cpe:2.3:a:mozilla:firefox:52.0:*:*:*:*:*:*:*
mozilla thunderbird < 52.1.0 cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

References for CVE-2017-5436

URL Tags
http://www.securityfocus.com/bid/97940 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1038320 Third Party Advisory VDB 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=1345461 Issue Tracking Vendor Advisory
https://security.gentoo.org/glsa/201706-25 Third Party Advisory
https://www.debian.org/security/2017/dsa-3831 Third Party Advisory
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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