dovecot: TLS SNI config lookups are inefficient and can be used for DoS
Published Mar 2, 2018
5.9
MEDIUMCVSS 3.0
EPSS 2.55%
Description
A denial of service flaw was found in dovecot before 2.2.34. An attacker able to generate random SNI server names could exploit TLS SNI configuration lookups, leading to excessive memory usage and the process to restart.
Affected products
-
- Version before 2.2.34StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| The Dovecot Project | Dovecot | n/a |
|
Configuration 2
- 8.0
- 9.0
Configuration 3
- 14.04
- 16.04
- 17.10
No data.
Red Hat Enterprise Linux 5
dovecot
Not affected
Red Hat Enterprise Linux 6
dovecot
Affected
Red Hat Enterprise Linux 7
dovecot
Affected
Red Hat Enterprise Linux 8
dovecot
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | dovecot | Not affected | n/a |
| Red Hat Enterprise Linux 6 | dovecot | Affected | n/a |
| Red Hat Enterprise Linux 7 | dovecot | Affected | n/a |
| Red Hat Enterprise Linux 8 | dovecot | 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.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
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
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.55% (0.02553) | 84.49th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.64% (0.02643) | 83.56th | v5 (v2026.06.15) |
| Mar 12, 2026 | 1.24% (0.01240) | 79.03th | v4 (v2025.03.14) |
| Oct 1, 2025 | 2.38% (0.02378) | 84.47th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.21% (0.01207) | 77.57th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.67% (0.00668) | 80.43th | v3 (v2023.03.01) |
| Feb 28, 2024 | 0.67% (0.00668) | 79.19th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.67% (0.00668) | 77.18th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.66% (0.00663) | 76.49th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.06% (0.02061) | 50.21th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.06% (0.02061) | 0.00th | v1 |
References (10)
- http://seclists.org/oss-sec/2018/q1/205 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-15130 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1532356 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/03/msg00036.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2017-15130
- https://usn.ubuntu.com/3587-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/3587-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2017-15130
- https://www.debian.org/security/2018/dsa-4130 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.dovecot.org/list/dovecot-news/2018-February/000370.html mailing-listx_refsource_MLISTRelease NotesVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://seclists.org/oss-sec/2018/q1/205 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2017-15130 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1532356 | x_refsource_CONFIRMIssue TrackingThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2018/03/msg00036.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-15130 | ||
| https://usn.ubuntu.com/3587-1/ | vendor-advisoryx_refsource_UBUNTUThird Party Advisory | |
| https://usn.ubuntu.com/3587-2/ | vendor-advisoryx_refsource_UBUNTU | |
| https://www.cve.org/CVERecord?id=CVE-2017-15130 | ||
| https://www.debian.org/security/2018/dsa-4130 | vendor-advisoryx_refsource_DEBIANThird Party Advisory | |
| https://www.dovecot.org/list/dovecot-news/2018-February/000370.html | mailing-listx_refsource_MLISTRelease NotesVendor Advisory |
Change history (0)
No recorded changes yet.