CVE-2016-6307
The state-machine implementation in OpenSSL 1.1.0 before 1.1.0a allocates memory before checking...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
5.9
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.
- Record
CVE-2016-6307- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2016-6307- Updated
- 2026-11-02
EUVDEUVD-2016-7236 No score
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.
- Record
EUVD-2016-7236- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6486-qv2g-xg8h
5.9
The state-machine implementation in OpenSSL 1.1.0 before 1.1.0a allocates memory before checking...
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.
- Record
GHSA-6486-qv2g-xg8h- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-400
- Updated
- 2026-11-02
OSVBELL-CVE-2016-6307
5.9
CVE-2016-6307 does not affect BellSoft software
- Record
BELL-CVE-2016-6307- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSV
5.9
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.
- Record
CVE-2016-6307- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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-2016-6307 is a medium vulnerability (CVSS 5.9) in Openssl, published September 26, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 13.8%, the 96th percentile. Fixed in kmod-vboxadditions 5.1.10-1.1.mga5.
References
openssl.org/news/secadv/20160922.txt
tenable.com/security/tns-2016-20
oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
www-01.ibm.com/support/docview.wss?uid=swg21995039
securitytracker.com/id/1036885
oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
Show 17 moreShow less
tenable.com/security/tns-2016-16
tenable.com/security/tns-2016-21
oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
bto.bluecoat.com/security-advisory/sa132
oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
securityfocus.com/bid/93152
git.openssl.org?p=openssl.git%3Ba=commit%3Bh=4b390b6c3f8df925dc92a3dd6b022baa9a2f4650
kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
nvd.nist.gov/vuln/detail/CVE-2016-6307
git.openssl.org?p=openssl.git;a=commit;h=4b390b6c3f8df925dc92a3dd6b022baa9a2f4650
github.com/advisories/GHSA-6486-qv2g-xg8h
docs.bell-sw.com/security/cves/CVE-2016-6307
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.