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NVD / CVE Program· CNA redhat

CVE-2016-6302: The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket…

HighCVSS 7.5 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 38/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 27.8% (FIRST EPSS); higher than 98.1% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: openssl (Alpine:v3.2) 1.0.2h-r3; openssl (Debian:12) 1.0.2i-1; openssl (Debian:7) 1.0.1t-1+deb7u1.

Low priority for now. Upgrade to openssl (Alpine:v3.2) 1.0.2h-r3; openssl (Debian:12) 1.0.2i-1; openssl (Debian:7) 1.0.1t-1+deb7u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket length, which allows remote attackers to cause a denial of service via a ticket that is too short.

Published
Sep 16, 2016
Updated
Jun 16, 2026
EPSS
27.8% · 98th percentile

Report tools

JSON

Action score

38

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
8 / 30 · 27.8%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
opensslopenssl
oraclelinux
oraclesolaris

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openssl openssl1.0.1
  • openssl openssl1.0.1a
  • openssl openssl1.0.1b
  • openssl openssl1.0.1c
  • openssl openssl1.0.1d
  • openssl openssl1.0.1e
  • openssl openssl1.0.1f
  • openssl openssl1.0.1g
+12 more rows
  • openssl openssl1.0.1h
  • openssl openssl1.0.1i
  • openssl openssl1.0.1j
  • openssl openssl1.0.1k
  • openssl openssl1.0.1l
  • openssl openssl1.0.1m
  • openssl openssl1.0.1n
  • openssl openssl1.0.1o
  • openssl openssl1.0.1p
  • openssl openssl1.0.1q
  • openssl openssl1.0.1r
  • openssl openssl1.0.1s

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.2opensslbefore 1.0.2h-r31.0.2h-r3
Debian:12opensslbefore 1.0.2i-11.0.2i-1
Debian:7opensslbefore 1.0.1t-1+deb7u11.0.1t-1+deb7u1
Debian:8opensslbefore 1.0.1t-1+deb8u41.0.1t-1+deb8u4
Red Hat:enterprise_linux:6::clientopensslbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-debuginfobefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-develbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-perlbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:6::clientopenssl-staticbefore 0:1.0.1e-48.el6_8.30:1.0.1e-48.el6_8.3
Red Hat:enterprise_linux:7::clientopensslbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-debuginfobefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-develbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-libsbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-perlbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:enterprise_linux:7::clientopenssl-staticbefore 1:1.0.1e-51.el7_2.71:1.0.1e-51.el7_2.7
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apache-commons-daemonbefore 0:1.1.0-1.redhat_2.1.jbcs.el60:1.1.0-1.redhat_2.1.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apache-commons-daemon-jsvcbefore 1:1.1.0-1.redhat_2.jbcs.el61:1.1.0-1.redhat_2.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apache-commons-daemon-jsvc-debuginfobefore 1:1.1.0-1.redhat_2.jbcs.el61:1.1.0-1.redhat_2.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-aprbefore 0:1.6.3-14.jbcs.el60:1.6.3-14.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apr-debuginfobefore 0:1.6.3-14.jbcs.el60:1.6.3-14.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apr-develbefore 0:1.6.3-14.jbcs.el60:1.6.3-14.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apr-utilbefore 0:1.6.1-9.jbcs.el60:1.6.1-9.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apr-util-debuginfobefore 0:1.6.1-9.jbcs.el60:1.6.1-9.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-apr-util-develbefore 0:1.6.1-9.jbcs.el60:1.6.1-9.jbcs.el6

+94

Same product

openssl: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows…KEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This week
  • CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code…
    65This week

Published before and after this one in the same product

  • ← EarlierCVE-2016-2181Sep 16, 2016 · The Anti-Replay feature in the DTLS implementation in OpenSSL before 1.1.0 mishandles early use of a new epoch number in conjunction with a…
    37Monitor
  • ← EarlierCVE-2016-2182Sep 16, 2016 · The BN_bn2dec function in crypto/bn/bn_print.c in OpenSSL before 1.1.0 does not properly validate division results, which allows remote…
    52Plan
  • Later →CVE-2016-6303Sep 16, 2016 · Integer overflow in the MDC2_Update function in crypto/mdc2/mdc2dgst.c in OpenSSL before 1.1.0 allows remote attackers to cause a denial of…
    49Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:openssl1.0.2h-r3 · Alpine:v3.2Package registry (OSV)
debian:openssl1.0.2i-1 · Debian:12Package registry (OSV)
red hat:jbcs-httpd24-apache-commons-daemon0:1.1.0-1.redhat_2.1.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-apache-commons-daemon-jsvc1:1.1.0-1.redhat_2.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-apache-commons-daemon-jsvc-debuginfo1:1.1.0-1.redhat_2.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-apr0:1.6.3-14.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-apr-debuginfo0:1.6.3-14.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:jbcs-httpd24-apr-devel0:1.6.3-14.jbcs.el7 · Red Hat:jboss_core_services:1::el7Package registry (OSV)
red hat:openssl0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-debuginfo0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-devel0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-libs1:1.0.1e-51.el7_2.7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:openssl-perl0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:openssl-static0:1.0.1e-48.el6_8.3 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
suse:compat-openssl0980.9.8j-102.1 · SUSE:Linux Enterprise Desktop 12 SP1Package registry (OSV)
suse:openssl1.0.1i-27.21.1 · SUSE:Linux Enterprise Server for SAP Applications 12Package registry (OSV)
suse:openssl11.0.1g-0.52.1 · SUSE:Linux Enterprise Server 11-SECURITYPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records