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CVE-2016-6307

29
FAUCET Score

CVE-2016-6307 is a denial-of-service vulnerability affecting OpenSSL 1.1.0 before 1.1.0a, where crafted TLS messages can lead to excessive memory allocation. This medium-severity flaw has a CVSS score of 5.9, indicating a network-based attack with high impact on availability and high attack complexity. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community attention and media coverage, including reports of a patch introducing a critical flaw.

Impacted Technologies

VendorProductVersion(s)CPE
1.1.0CPE matchmatch criteria
cpe:2.3:a:openssl:openssl:1.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
13.84%
Probability of exploitation in next 30 days
EPSS Percentile
96.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1384 is in the 96th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-6307Low

openssl: excessive allocation of memory in tls_get_message_header()

Sep 21, 2016

References

kb.juniper.net / InfoCenter/index
bto.bluecoat.com / security-advisory/sa132
cert-portal.siemens.com / productcert/pdf/ssa-412672.pdf
git.openssl.org
openssl.org / news/secadv/20160922.txt
Vendor Advisory
tenable.com / security/tns-2016-16
tenable.com / security/tns-2016-20
tenable.com / security/tns-2016-21
www-01.ibm.com / support/docview.wss
oracle.com / technetwork/security-advisory/cpuapr2018-3678067.html
oracle.com / technetwork/security-advisory/cpujan2018-3236628.html
oracle.com / technetwork/security-advisory/cpujul2017-3236622.html
oracle.com / technetwork/security-advisory/cpuoct2016-2881722.html
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
securityfocus.com / bid/93152
securitytracker.com / id/1036885