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Vulnerability details: VCID-tekz-b2u3-8fcs
Vulnerability ID VCID-tekz-b2u3-8fcs
Aliases CVE-2016-1523
Summary Security researcher Holger Fuhrmannek reported that a malicious Graphite "smart font" could circumvent the validation of internal instruction parameters in the Graphite 2 library using special CNTXT_ITEM instructions. This could result in arbitrary code execution. This issue affected Graphite 2 version 1.3.4, which was used in the Firefox ESR branch. To address this issue and other security vulnerabilities recently disclosed by Cisco Talos affecting this version of the library, Firefox ESR has been updated to version 1.3.5, the same one used in Firefox 44. In general this flaw cannot be exploited through email in the Thunderbird product, but is potentially a risk in browser or browser-like contexts.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-122 Heap-based Buffer Overflow
System Score Found at
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
epss 0.00837 https://api.first.org/data/v1/epss?cve=CVE-2016-1523
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2016-14
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-1523.json
https://api.first.org/data/v1/epss?cve=CVE-2016-1523
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1521
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1522
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1526
1305813 https://bugzilla.redhat.com/show_bug.cgi?id=1305813
CVE-2016-1523 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1523
mfsa2016-14 https://www.mozilla.org/en-US/security/advisories/mfsa2016-14
RHSA-2016:0197 https://access.redhat.com/errata/RHSA-2016:0197
RHSA-2016:0258 https://access.redhat.com/errata/RHSA-2016:0258
RHSA-2016:0594 https://access.redhat.com/errata/RHSA-2016:0594
USN-2902-1 https://usn.ubuntu.com/2902-1/
USN-2904-1 https://usn.ubuntu.com/2904-1/
No exploits are available.
Exploit Prediction Scoring System (EPSS)
Percentile 0.73723
EPSS Score 0.00837
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:10:10.201109+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2016/mfsa2016-14.md 37.0.0