Resource exhaustion in OpenSSL
CVE-2016-6307
The state-machine implementation in OpenSSL 1.1.0 before 1.1.0a allocates memory before checking for an excessive length, which might allow remote attackers to cause a denial of service (memory consumption) via crafted TLS messages, related to statem/statem.c and statem/statem_lib.c.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.138 (96.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.138 · newest: 0.138 · change: 0.000
Affected products
- OpenSSL — versions 1.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openssl.org/news/secadv/20160922.txt (Vendor Advisory)
- www.tenable.com/security/tns-2016-20
- www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- www-01.ibm.com/support/docview.wss
- www.securitytracker.com/id/1036885 (vdb-entry)
- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- www.tenable.com/security/tns-2016-16
- www.tenable.com/security/tns-2016-21
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
Frequently asked questions
- What is CVE-2016-6307?
- CVE-2016-6307 is a medium-severity vulnerability in OpenSSL, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2016-09-26.
- How severe is CVE-2016-6307?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2016-6307 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.