HIGH
openssl: SSL_peek() hang on empty record
Published Sep 26, 2016
7.5
HIGHCVSS 3.0
EPSS 16.00%
Description
The ssl3_read_bytes function in record/rec_layer_s3.c in OpenSSL 1.1.0 before 1.1.0a allows remote attackers to cause a denial of service (infinite loop) by triggering a zero-length record in an SSL_peek call.
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
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
1 other source (Red Hat) ▾
5.9 MEDIUM Red Hat
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
16.00% 0.15997
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.15997
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 (55 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 16.00% (0.15997) | 96.81th | v5 (v2026.06.15) |
| Jun 15, 2026 | 16.00% (0.15997) | 96.48th | v5 (v2026.06.15) |
| Jun 4, 2026 | 35.95% (0.35953) | 97.17th | v4 (v2025.03.14) |
| Apr 21, 2026 | 24.93% (0.24930) | 96.17th | v4 (v2025.03.14) |
| Mar 22, 2026 | 32.97% (0.32972) | 96.84th | v4 (v2025.03.14) |
| Mar 4, 2026 | 23.08% (0.23082) | 95.81th | v4 (v2025.03.14) |
| Mar 3, 2026 | 7.70% (0.07700) | 91.80th | v4 (v2025.03.14) |
| Mar 1, 2026 | 10.48% (0.10476) | 93.14th | v4 (v2025.03.14) |
| Feb 28, 2026 | 29.29% (0.29292) | 96.49th | v4 (v2025.03.14) |
| Feb 4, 2026 | 32.75% (0.32754) | 96.75th | v4 (v2025.03.14) |
| Feb 1, 2026 | 15.85% (0.15845) | 94.59th | v4 (v2025.03.14) |
| Jan 4, 2026 | 32.75% (0.32754) | 96.72th | v4 (v2025.03.14) |
| Jan 1, 2026 | 15.85% (0.15845) | 94.57th | v4 (v2025.03.14) |
| Dec 4, 2025 | 33.47% (0.33465) | 96.74th | v4 (v2025.03.14) |
| Dec 1, 2025 | 16.61% (0.16605) | 94.71th | v4 (v2025.03.14) |
| Nov 10, 2025 | 33.47% (0.33465) | 96.72th | v4 (v2025.03.14) |
| Nov 4, 2025 | 31.20% (0.31201) | 96.54th | v4 (v2025.03.14) |
| Nov 1, 2025 | 15.15% (0.15154) | 94.34th | v4 (v2025.03.14) |
| Oct 4, 2025 | 31.20% (0.31201) | 96.60th | v4 (v2025.03.14) |
| Oct 1, 2025 | 15.15% (0.15154) | 94.38th | v4 (v2025.03.14) |
| Sep 8, 2025 | 31.20% (0.31201) | 96.62th | v4 (v2025.03.14) |
| Sep 4, 2025 | 33.47% (0.33465) | 96.80th | v4 (v2025.03.14) |
| Sep 1, 2025 | 16.61% (0.16605) | 94.70th | v4 (v2025.03.14) |
| Aug 5, 2025 | 33.47% (0.33465) | 96.76th | v4 (v2025.03.14) |
| Aug 1, 2025 | 16.61% (0.16605) | 94.68th | v4 (v2025.03.14) |
| Jul 10, 2025 | 33.47% (0.33465) | 96.73th | v4 (v2025.03.14) |
| Jul 5, 2025 | 36.69% (0.36687) | 96.95th | v4 (v2025.03.14) |
| Jul 1, 2025 | 19.02% (0.19015) | 95.06th | v4 (v2025.03.14) |
| Jun 5, 2025 | 36.69% (0.36687) | 96.92th | v4 (v2025.03.14) |
| Jun 1, 2025 | 19.02% (0.19015) | 95.03th | v4 (v2025.03.14) |
| May 6, 2025 | 36.69% (0.36687) | 96.89th | v4 (v2025.03.14) |
| May 1, 2025 | 19.02% (0.19015) | 94.99th | v4 (v2025.03.14) |
| Apr 14, 2025 | 36.69% (0.36687) | 96.84th | v4 (v2025.03.14) |
| Apr 13, 2025 | 19.02% (0.19015) | 94.85th | v4 (v2025.03.14) |
| Apr 10, 2025 | 36.08% (0.36077) | 96.79th | v4 (v2025.03.14) |
| Apr 9, 2025 | 17.71% (0.17712) | 94.59th | v4 (v2025.03.14) |
| Apr 8, 2025 | 36.08% (0.36077) | 96.78th | v4 (v2025.03.14) |
| Apr 7, 2025 | 17.71% (0.17712) | 94.59th | v4 (v2025.03.14) |
| Apr 2, 2025 | 36.65% (0.36649) | 96.82th | v4 (v2025.03.14) |
| Apr 1, 2025 | 18.10% (0.18096) | 94.67th | v4 (v2025.03.14) |
| Mar 28, 2025 | 36.65% (0.36649) | 96.81th | v4 (v2025.03.14) |
| Mar 27, 2025 | 18.10% (0.18096) | 94.33th | v4 (v2025.03.14) |
| Mar 17, 2025 | 36.08% (0.36077) | 96.73th | v4 (v2025.03.14) |
| Mar 11, 2025 | 42.48% (0.42481) | 97.48th | v3 (v2023.03.01) |
| Dec 17, 2024 | 48.86% (0.48860) | 97.58th | v3 (v2023.03.01) |
| Mar 8, 2024 | 57.27% (0.57272) | 97.61th | v3 (v2023.03.01) |
| Dec 28, 2023 | 49.69% (0.49686) | 97.22th | v3 (v2023.03.01) |
| Nov 8, 2023 | 41.93% (0.41929) | 96.94th | v3 (v2023.03.01) |
| Aug 30, 2023 | 34.93% (0.34932) | 96.56th | v3 (v2023.03.01) |
| Jul 18, 2023 | 9.22% (0.09221) | 93.86th | v3 (v2023.03.01) |
| Mar 23, 2023 | 7.39% (0.07394) | 93.01th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.85% (0.03854) | 90.51th | v3 (v2023.03.01) |
| Mar 6, 2023 | 6.58% (0.06584) | 91.39th | v2 (v2022.01.01) |
| Apr 1, 2022 | 6.58% (0.06584) | 90.55th | v2 (v2022.01.01) |
| Feb 4, 2022 | 6.58% (0.06584) | 78.46th | v2 (v2022.01.01) |
Weaknesses (2)
References (22)
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
- http://www-01.ibm.com/support/docview.wss?uid=swg21995039
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.securityfocus.com/bid/93149 vdb-entry
- http://www.securitytracker.com/id/1036879 vdb-entry
- https://access.redhat.com/security/cve/CVE-2016-6305 Vendor Advisory
- https://bto.bluecoat.com/security-advisory/sa132
- https://bugzilla.redhat.com/show_bug.cgi?id=1378127 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=63658103d4441924f8dbfc517b99bb54758a98b9
- https://github.com/openssl/openssl/issues/1563 ExploitIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-6305
- https://security.gentoo.org/glsa/201612-16 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2016-6305
- https://www.openssl.org/news/secadv/20160922.txt Vendor Advisory
- https://www.tenable.com/security/tns-2016-16
- https://www.tenable.com/security/tns-2016-20
- https://www.tenable.com/security/tns-2016-21
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Sep 26, 2016
Updated Aug 6, 2024
Reserved Jul 26, 2016
Link CVE-2016-6305
CISA Vulnrichment
Updated n/a