Is CVE-2016-6304 in the CISA KEV catalog?

No. CVE-2016-6304 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-6304?

CVE-2016-6304 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-6304?

CVE-2016-6304 has an EPSS score of 63.03% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-6304?

Upgrade openssl on debian 11 to 1.0.2i-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2016-6304

HIGHEPSS 99th pctl

7.5

CVSS v3

NVD

Description

Multiple memory leaks in t1_lib.c in OpenSSL before 1.0.1u, 1.0.2 before 1.0.2i, and 1.1.0 before 1.1.0a allow remote attackers to cause a denial of service (memory consumption) via large OCSP Status Request extensions.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

opensslDebian

Fixed in:1.0.2i-1CVE-2016-6304

libssl1.0.0Ubuntu

Fixed in:1.0.1f-1ubuntu2.20USN-3087-1

Fixed in:1.0.2g-1ubuntu4.4USN-3087-1

opensslUbuntu

Fixed in:1.0.1f-1ubuntu2.20USN-3087-1

Fixed in:1.0.2g-1ubuntu4.4USN-3087-1

Node.jsWindows application

Affected:0.12.0 0.12.16Fixed in:0.12.16Node.js Foundation

Affected:4.0.0 4.6.0Fixed in:4.6.0Node.js Foundation

Affected:6.0.0 6.7.0Fixed in:6.7.0Node.js Foundation

Affected:0.10.0 0.10.47Fixed in:0.10.47Node.js Foundation

Node.js (LTS)Windows application

Affected:0.12.0 0.12.16Fixed in:0.12.16Node.js Foundation

Affected:6.0.0 6.7.0Fixed in:6.7.0Node.js Foundation

Affected:0.10.0 0.10.47Fixed in:0.10.47Node.js Foundation

Affected:4.0.0 4.6.0Fixed in:4.6.0Node.js Foundation

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

63.03%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2019-12265	Medium	5.3	55%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	19%	-	-
CVE-2018-0891	Medium	4.3	15%	-	-

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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.