UBUNTU-CVE-2025-59028

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Source
https://ubuntu.com/security/CVE-2025-59028
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-59028.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2025-59028
Upstream
Downstream
Related
Published
2026-03-27T00:00:00Z
Modified
2026-05-04T10:33:45.711180Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.

References

Affected packages

Ubuntu:25.10 / dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot@1:2.4.1+dfsg1-5ubuntu4.1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.4.1+dfsg1-5ubuntu4.1

Affected versions

1:2.*
1:2.3.21.1+dfsg1-1ubuntu2
1:2.4.1+dfsg1-5ubuntu1
1:2.4.1+dfsg1-5ubuntu3
1:2.4.1+dfsg1-5ubuntu4

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-auth-lua"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-core"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-flatcurve"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-gssapi"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-imapd"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-ldap"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-lmtpd"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-managesieved"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-mysql"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-pgsql"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-pop3d"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-sieve"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-solr"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-sqlite"
        },
        {
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1",
            "binary_name": "dovecot-submissiond"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-59028.json"