CVE-2016-6309
Publication date 26 September 2016
Last updated 25 August 2025
Ubuntu priority
Description
statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a denial of service (use-after-free) or possibly execute arbitrary code via a crafted TLS session.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| openssl | 16.04 LTS xenial |
Not affected
|
| 14.04 LTS trusty |
Not affected
|
|
| openssl098 | 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release | |
Notes
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |