The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow…
Priority LOW 32CWE-295Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-295.
Summary
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.
Why it matters now
EPSS 0.02842 86th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* | up to 2.2.16 | Vulnerable | The Dovecot Project |
| cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:* | 20 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:* | 21 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:* | 22 | Vulnerable | Fedoraproject |
- cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:* Versions up to 2.2.16 Vulnerable ·The Dovecot Project
- cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:* Versions 20 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:* Versions 21 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:* Versions 22 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 3 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2015-3420
- 2026-10-03 Alias added: GHSA-2h34-774g-95vx
References
Advisory 8
- [oss-security] 20150428 Re: Re: CVE request: Dovecot remote DoS on TLS connections
- [dovecot] 20150424 [patch] TLS Handshake failures can crash imap-login
- [dovecot-news] 20150513 [Dovecot-news] v2.2.17 released
- FEDORA-2015-7159
- FEDORA-2015-7156
- https://bugzilla.redhat.com/show_bug.cgi?id=1216057
- FEDORA-2015-7089
- [oss-security] 20150427 Re: CVE request: Dovecot remote DoS on TLS connections
Sources
- CVE-2015-3420 · CVE Program
- CVE-2015-3420 · NVD
- FIRST EPSS
- GHSA-2h34-774g-95vx · GitHub Advisory Database · CC BY 4.0
- CVE-2015-3420 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences