Is CVE-2016-1523 in the CISA KEV catalog?

No. CVE-2016-1523 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1523?

CVE-2016-1523 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2016-1523?

CVE-2016-1523 has an EPSS score of 2.32% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1523?

Upgrade graphite2 on debian 11 to 1.3.5-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1523

MEDIUMEPSS 81th pctl

6.5

CVSS v3

NVD

Description

The SillMap::readFace function in FeatureMap.cpp in Libgraphite in Graphite 2 1.2.4, as used in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.6.1, mishandles a return value, which allows remote attackers to cause a denial of service (missing initialization, NULL pointer dereference, and application crash) via a crafted Graphite smart font.

How to fix

Remediation Available

graphite2Debian

Fixed in:1.3.5-1CVE-2016-1523

graphite2Ubuntu

Fixed in:1.2.4-1ubuntu1.1USN-2902-1

libgraphite2-3Ubuntu

Fixed in:1.2.4-1ubuntu1.1USN-2902-1

thunderbirdUbuntu

Fixed in:1:38.6.0+build1-0ubuntu0.14.04.1USN-2904-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

2.32%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.