CVE-2016-6309
statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call,...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
9.8
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.
- Record
CVE-2016-6309- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-416
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2016-6309- Updated
- 2026-11-02
EUVDEUVD-2016-7238 No score
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.
- Record
EUVD-2016-7238- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5qvw-r534-xcm4
9.8
statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call,...
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.
- Record
GHSA-5qvw-r534-xcm4- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
OSVBELL-CVE-2016-6309
9.8
CVE-2016-6309 does not affect BellSoft software
- Record
BELL-CVE-2016-6309- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSV
9.8
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.
- Record
CVE-2016-6309- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVMGASA-2016-0408 No score
Updated virtualbox packages fixes security vulnerabilities
This update provides virtualbox 5.1.10 maintenance release and resolves at least the following security issues:
OpenSSL through 1.0.2h incorrectly uses pointer arithmetic for heap-buffer boundary checks, which might allow remote attackers to cause a denial of service (integer overflow and application crash) or possibly have unspecified other impact by leveraging unexpected malloc behavior, related to s3_srvr.c, ssl_sess.c, and t1_lib.c (CVE-2016-2177).
The dsa_sign_setup function in crypto/dsa/dsa_ossl.c in OpenSSL through 1.0.2h does not properly ensure the use of constant-time operations, which makes it easier for local users to discover a DSA private key via a timing side-channel attack (CVE-2016-2178).
The DTLS implementation in OpenSSL before 1.1.0 does not properly restrict the lifetime of queue entries associated with unused out-of-order messages, which allows remote attackers to cause a denial of service (memory consumption) by maintaining many crafted DTLS sessions simultaneously, related to d1_lib.c, statem_dtls.c, statem_lib.c, and statem_srvr.c (CVE-2016-2179).
The TS_OBJ_print_bio function in crypto/ts/ts_lib.c in the X.509 Public Key Infrastructure Time-Stamp Protocol (TSP) implementation in OpenSSL through 1.0.2h allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted time-stamp file that is mishandled by the "openssl ts" command (CVE-2016-2180).
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 large sequence number, which allows remote attackers to cause a denial of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and ssl3_record.c (CVE-2016-2181).
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 large sequence number, which allows remote attackers to cause a denial of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and ssl3_record.c (CVE-2016-2182).
The DES and Triple DES ciphers, as used in the TLS, SSH, and IPSec protocols and other protocols and products, have a birthday bound of approximately four billion blocks, which makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTPS session using Triple DES in CBC mode, aka a "Sweet32" attack (CVE-2016-2183).
Unspecified vulnerability in the Oracle VM VirtualBox component before 5.0.28 and 5.1.x before 5.1.8 in Oracle Virtualization allows local users to affect confidentiality, integrity, and availability via vectors related to Core, a different vulnerability than CVE-2016-5538 (CVE-2016-5501).
Unspecified vulnerability in the Oracle VM VirtualBox component before 5.0.28 and 5.1.x before 5.1.8 in Oracle Virtualization allows local users to affect confidentiality, integrity, and availability via vectors related to Core, a different vulnerability than CVE-2016-5501 (CVE-2016-5538).
Unspecified vulnerability in the Oracle VM VirtualBox component before 5.1.4 in Oracle Virtualization allows remote attackers to affect confidentiality and integrity via vectors related to VRDE (CVE-2016-5605).
Unspecified vulnerability in the Oracle VM VirtualBox component before 5.0.28 and 5.1.x before 5.1.8 in Oracle Virtualization allows local users to affect availability via vectors related to Core, a different vulnerability than CVE-2016-5613 (CVE-2016-5608).
Unspecified vulnerability in the Oracle VM VirtualBox component before 5.0.28 and 5.1.x before 5.1.8 in Oracle Virtualization allows local users to affect confidentiality, integrity, and availability via vectors related to Core (CVE-2016-5610, CVE-2016-5611)
Unspecified vulnerability in the Oracle VM VirtualBox component before 5.0.28 and 5.1.x before 5.1.8 in Oracle Virtualization allows local users to…
- Record
MGASA-2016-0408- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
kmod-vboxadditionsMageia:5 |
before 5.1.10-1.1.mga5 | 5.1.10-1.1.mga5 |
kmod-virtualboxMageia:5 |
before 5.1.10-1.1.mga5 | 5.1.10-1.1.mga5 |
virtualboxMageia:5 |
before 5.1.10-1.1.mga5 | 5.1.10-1.1.mga5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2016-6309 is a critical vulnerability (CVSS 9.8) in Openssl, published September 26, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 70.2%, the 99th percentile. Fixed in kmod-vboxadditions 5.1.10-1.1.mga5.
References
tenable.com/security/tns-2016-20
oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
openssl.org/news/secadv/20160926.txt
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_us
www-01.ibm.com/support/docview.wss?uid=swg21995039
securitytracker.com/id/1036885
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oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
tenable.com/security/tns-2016-16
git.openssl.org?p=openssl.git%3Ba=commit%3Bh=acacbfa7565c78d2273c0b2a2e5e803f44afefeb
securityfocus.com/bid/93177
oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
bto.bluecoat.com/security-advisory/sa132
oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
nvd.nist.gov/vuln/detail/CVE-2016-6309
git.openssl.org?p=openssl.git;a=commit;h=acacbfa7565c78d2273c0b2a2e5e803f44afefeb
github.com/advisories/GHSA-5qvw-r534-xcm4
docs.bell-sw.com/security/cves/CVE-2016-6309
advisories.mageia.org/MGASA-2016-0408.html
bugs.mageia.org/show_bug.cgi?id=19213
virtualbox.org/wiki/Changelog
Left out here: the rest of 1 source description. The JSON record has them.