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    CVE-2015-3420

    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.

    Published:Apr 26, 2015
    Last Modified:Apr 20, 2025
    EPS:Sep 19, 2017
    EPSS Score:0.09152
    CVSS Score:5.9

    Affected Products

    Vendor
    Dovecot
    Product
    Dovecot
    Vendor
    Fedoraproject
    Product
    Fedora

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-42006 (CVSS 4.3) — An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 wa…
    CVE-2026-40020 (CVSS 3.1) — Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if im…
    CVE-2026-40016 (CVSS 5.3) — Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU ti…
    CVE-2026-33603 (CVSS 6.8) — Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel bind…
    CVE-2026-27851 (CVSS 7.4) — When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly i…
    CVE-2026-27860 (CVSS 3.7) — If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authenticati…
    CVE-2026-27859 (CVSS 5.3) — A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suit…
    CVE-2026-27858 (CVSS 7.5) — Attacker can send a specifically crafted message before authentication that causes managesieve to allocate lar…
    CVE-2026-27857 (CVSS 4.3) — Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer c…
    CVE-2026-27856 (CVSS 7.4) — Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An atta…

    References

    http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157030.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158236.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158261.html
    http://www.openwall.com/lists/oss-security/2015/04/27/1
    http://www.openwall.com/lists/oss-security/2015/04/28/4
    http://www.securityfocus.com/bid/74335
    https://bugzilla.redhat.com/show_bug.cgi?id=1216057
    https://dovecot.org/pipermail/dovecot-news/2015-May/000292.html
    https://dovecot.org/pipermail/dovecot/2015-April/100618.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157030.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158236.html
    http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158261.html
    http://www.openwall.com/lists/oss-security/2015/04/27/1
    http://www.openwall.com/lists/oss-security/2015/04/28/4
    http://www.securityfocus.com/bid/74335
    https://bugzilla.redhat.com/show_bug.cgi?id=1216057
    https://dovecot.org/pipermail/dovecot-news/2015-May/000292.html
    https://dovecot.org/pipermail/dovecot/2015-April/100618.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High