dovecot: SSL/TLS handshake failures leading to a crash of the login process.
Published Sep 19, 2017
5.9
MEDIUMCVSS 3.0
EPSS 2.84%
Description
The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote attackers to cause a denial of service (login process crash) via vectors related to handshake failures.
Affected products
No data.
Configuration 2
- 20
- 21
- 22
No data.
Red Hat Enterprise Linux 5
dovecot
Not affected
Red Hat Enterprise Linux 6
dovecot
Not affected
Red Hat Enterprise Linux 7
dovecot
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | dovecot | Not affected | n/a |
| Red Hat Enterprise Linux 6 | dovecot | Not affected | n/a |
| Red Hat Enterprise Linux 7 | dovecot | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of dovecot as shipped with Red Hat Enterprise Linux 5, 6, and 7.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:M/Au:N/C:N/I:N/A:P
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 (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.84% (0.02842) | 86.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.84% (0.02842) | 84.78th | v5 (v2026.06.15) |
| Dec 28, 2025 | 7.63% (0.07633) | 91.56th | v4 (v2025.03.14) |
| Dec 27, 2025 | 9.15% (0.09152) | 92.44th | v4 (v2025.03.14) |
| Oct 28, 2025 | 7.63% (0.07633) | 91.46th | v4 (v2025.03.14) |
| Oct 27, 2025 | 9.15% (0.09152) | 92.33th | v4 (v2025.03.14) |
| Oct 1, 2025 | 7.63% (0.07633) | 91.56th | v4 (v2025.03.14) |
| Jul 30, 2025 | 9.15% (0.09152) | 92.34th | v4 (v2025.03.14) |
| Mar 30, 2025 | 7.63% (0.07633) | 91.05th | v4 (v2025.03.14) |
| Mar 29, 2025 | 10.78% (0.10777) | 88.86th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.63% (0.07633) | 91.25th | v4 (v2025.03.14) |
| Dec 17, 2024 | 4.36% (0.04363) | 92.27th | v3 (v2023.03.01) |
| Dec 12, 2024 | 2.97% (0.02974) | 91.25th | v3 (v2023.03.01) |
| Jul 10, 2024 | 2.39% (0.02390) | 89.99th | v3 (v2023.03.01) |
| Mar 22, 2023 | 2.14% (0.02141) | 87.49th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.85% (0.01850) | 86.46th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.97% (0.01974) | 78.97th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.97% (0.01974) | 77.12th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.97% (0.01974) | 56.20th | v2 (v2022.01.01) |
References (12)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157030.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158236.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158261.html vendor-advisoryx_refsource_FEDORAThird Party Advisory
- http://www.openwall.com/lists/oss-security/2015/04/27/1 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2015/04/28/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/74335 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2015-3420 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1216057 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://dovecot.org/pipermail/dovecot-news/2015-May/000292.html mailing-listx_refsource_MLISTVendor Advisory
- https://dovecot.org/pipermail/dovecot/2015-April/100618.html mailing-listx_refsource_MLISTVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2015-3420
- https://www.cve.org/CVERecord?id=CVE-2015-3420
Change history (0)
No recorded changes yet.