Is CVE-2016-1521 in the CISA KEV catalog?

No. CVE-2016-1521 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1521?

CVE-2016-1521 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2016-1521?

CVE-2016-1521 has an EPSS score of 4.06% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1521?

Upgrade graphite2 on debian 11 to 1.3.5-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1521

HIGHEPSS 89th pctl

8.8

CVSS v3

NVD

Description

The directrun function in directmachine.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, does not validate a certain skip operation, which allows remote attackers to execute arbitrary code, obtain sensitive information, or cause a denial of service (out-of-bounds read and application crash) via a crafted Graphite smart font.

CWE-119Buffer Overflow

How to fix

Remediation Available

graphite2Debian

Fixed in:1.3.5-1CVE-2016-1521

graphite2Ubuntu

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

libgraphite2-3Ubuntu

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

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.06%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Third-Party Advisory5

Other references13

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.