CVE-2017-5436 — An out-of-bounds write in the Graphite 2 library triggered with a maliciously cr

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, Fire

01What is this vulnerability?

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.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-06-11T21:29:05.827
• Last modified: 2026-10-16T15:29:13.000

09References

• www.securityfocus.com — http://www.securityfocus.com/bid/97940
• www.securitytracker.com — http://www.securitytracker.com/id/1038320
• access.redhat.com — https://access.redhat.com/errata/RHSA-2017:1104
• access.redhat.com — https://access.redhat.com/errata/RHSA-2017:1106
• access.redhat.com — https://access.redhat.com/errata/RHSA-2017:1201
• bugzilla.mozilla.org — https://bugzilla.mozilla.org/show_bug.cgi?id=1345461
• security.gentoo.org — https://security.gentoo.org/glsa/201706-25
• www.debian.org — https://www.debian.org/security/2017/dsa-3831
• www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2017-10/
• www.mozilla.org — https://www.mozilla.org/security/advisories/mfsa2017-11/