Is CVE-2016-6306 in the CISA KEV catalog?

No. CVE-2016-6306 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-6306?

CVE-2016-6306 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2016-6306?

CVE-2016-6306 has an EPSS score of 41.68% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-6306?

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

CVE & CISA-KEV Catalog

CVE-2016-6306

MEDIUMEPSS 99th pctl

5.9

CVSS v3

NVD

Description

The certificate parser in OpenSSL before 1.0.1u and 1.0.2 before 1.0.2i might allow remote attackers to cause a denial of service (out-of-bounds read) via crafted certificate operations, related to s3_clnt.c and s3_srvr.c.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

opensslDebian

Fixed in:1.0.2i-1CVE-2016-6306

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:4.2.0 4.6.0Fixed in:4.6.0Node.js Foundation

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

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

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:4.2.0 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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

41.68%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-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix

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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.