CVE-2016-6305
Summary
| CVE | CVE-2016-6305 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2016-09-26 19:59:01 UTC |
| Updated | 2026-05-06 22:30:45 UTC |
| Description | The ssl3_read_bytes function in record/rec_layer_s3.c in OpenSSL 1.1.0 before 1.1.0a allows remote attackers to cause a denial of service (infinite loop) by triggering a zero-length record in an SSL_peek call. |
Risk And Classification
Primary CVSS: v3.0 7.5 HIGH from [email protected]
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.249300000 probability, percentile 0.961940000 (date 2026-05-07)
Problem Types: CWE-20 | n/a
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.0 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 2.0 | [email protected] | Primary | 5 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
LowAuthentication
NoneConfidentiality
NoneIntegrity
NoneAvailability
PartialAV:N/AC:L/Au:N/C:N/I:N/A:P
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.openssl.org/news/secadv/20160922.txt | af854a3a-2127-422b-91ae-364da2661108 | www.openssl.org | Vendor Advisory |
| Oracle Critical Patch Update - October 2016 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| SA132 : OpenSSL Vulnerabilities 22-Sep-2016 and 26-Sep-2016 | af854a3a-2127-422b-91ae-364da2661108 | bto.bluecoat.com | |
| OpenSSL: Multiple vulnerabilities (GLSA 201612-16) — Gentoo security | af854a3a-2127-422b-91ae-364da2661108 | security.gentoo.org | |
| OpenSSL SSL_peek() Bug Lets Remote Authenticated Users Cause the Target Service to Hang - SecurityTracker | af854a3a-2127-422b-91ae-364da2661108 | www.securitytracker.com | |
| Juniper Networks - 2016-10 Security Bulletin: OpenSSL security updates | af854a3a-2127-422b-91ae-364da2661108 | kb.juniper.net | |
| Oracle Critical Patch Update - October 2017 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| git.openssl.org Git - openssl.git/commit | af854a3a-2127-422b-91ae-364da2661108 | git.openssl.org | |
| Oracle Critical Patch Update - January 2018 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| [R1] LCE 4.8.2 Fixes Multiple Third-party Library Vulnerabilities - Security Advisory | Tenable Network Security | af854a3a-2127-422b-91ae-364da2661108 | www.tenable.com | |
| Oracle Critical Patch Update - April 2018 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| IBM Security Bulletin: Vulnerabilities in OpenSSL, OpenVPN and GNU glibc affect IBM Security Virtual Server Protection for VMware - United States | af854a3a-2127-422b-91ae-364da2661108 | www-01.ibm.com | |
| OpenSSL CVE-2016-6305 Denial of Service Vulnerability | af854a3a-2127-422b-91ae-364da2661108 | www.securityfocus.com | |
| cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf | af854a3a-2127-422b-91ae-364da2661108 | cert-portal.siemens.com | |
| Oracle Critical Patch Update - July 2017 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| [R2] PVS 5.2.0 Fixes Multiple Third-party Library Vulnerabilities - Security Advisory | Tenable Network Security | af854a3a-2127-422b-91ae-364da2661108 | www.tenable.com | |
| OpenSSL 1.1.0 hangs (CPU pegged) when SSL_peek is used with TLSv1 · Issue #1563 · openssl/openssl · GitHub | af854a3a-2127-422b-91ae-364da2661108 | github.com | Exploit, Issue Tracking |
| [R5] Nessus 6.9 Fixes Multiple Vulnerabilities - Security Advisory | Tenable Network Security | af854a3a-2127-422b-91ae-364da2661108 | www.tenable.com | |
| git.openssl.org Git - openssl.git/commit | MITRE | git.openssl.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 591280 Siemens SCALANCE X-200RNA Switch Devices Denial of Service (DoS) Multiple Vulnerabilities (ICSA-22-349-21, SSA-412672)