CVE-2015-3420

The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote...

5.9 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

2.84%Up 0.9 points since Feb 4, 2022

What each source reports

NVD Score used 5.9

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.

Record: CVE-2015-3420
CVSS 3.0: 5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-295
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2015-3420
Updated: 2026-11-02

EUVDEUVD-2015-3464 No score

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.

Record: EUVD-2015-3464
Updated: 2026-11-03

GitHub AdvisoriesGHSA-2h34-774g-95vx 5.9

The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote...

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.

Record: GHSA-2h34-774g-95vx
CVSS 3.0: 5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-295
Updated: 2026-11-02

OSV 5.9

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.

Record: CVE-2015-3420
CVSS 3.0: 5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2015-3420 5.9

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.

Record: DEBIAN-CVE-2015-3420
CVSS 3.0: 5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`dovecot` Debian:12	before 1:2.2.13-12	1:2.2.13-12
`dovecot` Debian:13	before 1:2.2.13-12	1:2.2.13-12
`dovecot` Debian:14	before 1:2.2.13-12	1:2.2.13-12

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2015-3420 is a medium vulnerability (CVSS 5.9) in Dovecot, published September 19, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.84%, the 86th percentile. Fixed in dovecot 1:2.2.13-12.

References

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