openssl: Use After Free for large message sizes
Published Sep 26, 2016
9.8
CRITICALCVSS 3.0
EPSS 70.22%
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 4
openssl
Not affected
Red Hat Enterprise Linux 5
openssl
Not affected
Red Hat Enterprise Linux 5
openssl097a
Not affected
Red Hat Enterprise Linux 6
openssl
Not affected
Red Hat Enterprise Linux 6
openssl098e
Not affected
Red Hat Enterprise Linux 7
openssl
Not affected
Red Hat Enterprise Linux 7
openssl098e
Not affected
Red Hat JBoss Enterprise Application Platform 5
openssl
Not affected
Red Hat JBoss Enterprise Application Platform 6
openssl
Not affected
Red Hat JBoss Enterprise Web Server 1
openssl
Not affected
Red Hat JBoss Enterprise Web Server 2
openssl
Not affected
Red Hat JBoss Enterprise Web Server 3
openssl
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssl098e | Not affected | n/a |
| Red Hat Enterprise Linux 7 | openssl | Not affected | n/a |
| Red Hat Enterprise Linux 7 | openssl098e | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 3 | openssl | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect any Red Hat product as they do not yet include OpenSSL 1.1.0.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 70.22% (0.70223) | 99.36th | v5 (v2026.06.15) |
| Jun 15, 2026 | 69.74% (0.69738) | 99.28th | v5 (v2026.06.15) |
| Mar 22, 2026 | 28.21% (0.28212) | 96.45th | v4 (v2025.03.14) |
| Mar 3, 2026 | 45.07% (0.45071) | 97.54th | v4 (v2025.03.14) |
| Nov 8, 2025 | 28.21% (0.28212) | 96.28th | v4 (v2025.03.14) |
| Nov 3, 2025 | 31.73% (0.31728) | 96.61th | v4 (v2025.03.14) |
| Nov 2, 2025 | 40.07% (0.40067) | 97.17th | v4 (v2025.03.14) |
| Nov 1, 2025 | 46.03% (0.46035) | 97.51th | v4 (v2025.03.14) |
| Jul 10, 2025 | 44.97% (0.44973) | 97.44th | v4 (v2025.03.14) |
| Apr 7, 2025 | 38.72% (0.38721) | 96.97th | v4 (v2025.03.14) |
| Mar 30, 2025 | 32.42% (0.32425) | 96.47th | v4 (v2025.03.14) |
| Mar 29, 2025 | 35.32% (0.35318) | 95.44th | v4 (v2025.03.14) |
| Mar 17, 2025 | 32.42% (0.32425) | 96.47th | v4 (v2025.03.14) |
| Dec 17, 2024 | 92.49% (0.92490) | 99.22th | v3 (v2023.03.01) |
| Dec 12, 2024 | 91.17% (0.91171) | 99.02th | v3 (v2023.03.01) |
| Dec 28, 2023 | 91.07% (0.91069) | 98.61th | v3 (v2023.03.01) |
| Nov 19, 2023 | 91.92% (0.91919) | 98.66th | v3 (v2023.03.01) |
| Nov 8, 2023 | 92.71% (0.92713) | 98.76th | v3 (v2023.03.01) |
| Jun 9, 2023 | 93.24% (0.93237) | 98.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 92.87% (0.92866) | 98.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.31% (0.07312) | 92.53th | v2 (v2022.01.01) |
| Apr 1, 2022 | 7.31% (0.07312) | 91.80th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.31% (0.07312) | 80.56th | v2 (v2022.01.01) |
References (18)
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 x_refsource_CONFIRM
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039 x_refsource_CONFIRM
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html x_refsource_CONFIRM
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/93177 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1036885 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2016-6309 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa132 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1379302 Issue Tracking
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=acacbfa7565c78d2273c0b2a2e5e803f44afefeb x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2016-6309
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03856en_us x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2016-6309
- https://www.openssl.org/news/secadv/20160926.txt x_refsource_CONFIRMVendor Advisory
- https://www.tenable.com/security/tns-2016-16 x_refsource_CONFIRM
- https://www.tenable.com/security/tns-2016-20 x_refsource_CONFIRM
Change history (0)
No recorded changes yet.