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CVE-2019-10691

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the...

7.5 HighFix available

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.80%Up 1.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
CVE-2019-10691
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated
2026-11-02
CVE List No score

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
CVE-2019-10691
Updated
2026-11-02
EUVDEUVD-2019-2485 No score

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
EUVD-2019-2485
Updated
2026-11-03
GitHub AdvisoriesGHSA-7m29-wr8r-5c2m 7.5

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the...

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
GHSA-7m29-wr8r-5c2m
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVALPINE-CVE-2019-10691 7.5

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
ALPINE-CVE-2019-10691
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 7.5

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
CVE-2019-10691
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVDEBIAN-CVE-2019-10691 7.5

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
DEBIAN-CVE-2019-10691
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2019-10691 7.5

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

Record
UBUNTU-CVE-2019-10691
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2019:1312-1 No score

Security update for dovecot23

This update for dovecot23 fixes the following issues:

Security issue fixed:

  • CVE-2019-10691: Fixed a denial of service via reachable assertion when processing invalid UTF-8 characters (bsc#1132501).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2019:1312-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10726-1 No score

dovecot23-2.3.16-1.6 on GA media

These are all security issues fixed in the dovecot23-2.3.16-1.6 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10726-1
Updated
2026-11-02
OSVopenSUSE-SU-2025:14715-1 No score

dovecot24-2.4.0-1.1 on GA media

These are all security issues fixed in the dovecot24-2.4.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:14715-1
Updated
2026-11-02
OSVSUSE-SU-2019:0997-1 No score

Security update for dovecot23

This update for dovecot23 fixes the following issues:

Security issue fixed:

  • CVE-2019-10691: Fixed a denial of service via reachable assertion when processing invalid UTF-8 characters (bsc#1132501).
Record
SUSE-SU-2019:0997-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
dovecot
Alpine:v3.10
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.11
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.12
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.13
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.14
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.15
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.16
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.17
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.18
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.19
 before 2.3.6-r0
2.3.6-r0
Show 14 moreShow less
Affected packages
PackageAffectedFixed
dovecot
Alpine:v3.20
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.21
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.22
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.23
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.24
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.8
 before 2.3.6-r0
2.3.6-r0
dovecot
Alpine:v3.9
 before 2.3.6-r0
2.3.6-r0
dovecot
Debian:12
 before 1:2.3.4.1-4
1:2.3.4.1-4
dovecot
Debian:13
 before 1:2.3.4.1-4
1:2.3.4.1-4
dovecot
Debian:14
 before 1:2.3.4.1-4
1:2.3.4.1-4
dovecot23
SUSE:Linux Enterprise Module for Server Applications 15
 before 2.3.3-4.13.1
2.3.3-4.13.1
dovecot23
openSUSE:Leap 15.0
 before 2.3.3-lp150.11.1
2.3.3-lp150.11.1
dovecot23
openSUSE:Tumbleweed
From an advisory covering 22 CVEs
 before 2.3.16-1.6
2.3.16-1.6
dovecot24
openSUSE:Tumbleweed
From an advisory covering 24 CVEs
 before 2.4.0-1.1
2.4.0-1.1

History

History
RecordedChangedSources
affected, facts
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-10691 is a high vulnerability (CVSS 7.5) in Dovecot, published April 18, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.80%, the 86th percentile. Fixed in dovecot 2.3.6-r0.

References

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