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CVE-2015-3420

17
FAUCET Score

CVE-2015-3420 describes a denial-of-service vulnerability in Dovecot versions prior to 2.2.17, specifically affecting configurations where SSLv3 is disabled. Remote attackers can trigger a login process crash through handshake failures. This vulnerability has a CVSSv3 score of 5.9 (Medium), indicating a network-based attack with high impact on availability and high attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.2.16CPE matchmatch criteria
cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
20CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*
21CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
22CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.84%
Probability of exploitation in next 30 days
EPSS Percentile
85.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0284 is in the 77th percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2015-3420Low

dovecot: SSL/TLS handshake failures leading to a crash of the login process.

Apr 26, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-May/157030.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-May/158236.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-May/158261.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
dovecot.org / pipermail/dovecot/2015-April/100618.html
Vendor Advisory
dovecot.org / pipermail/dovecot-news/2015-May/000292.html
Vendor Advisory
openwall.com / lists/oss-security/2015/04/27/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2015/04/28/4
Mailing ListThird Party Advisory
securityfocus.com / bid/74335
Third Party AdvisoryVDB Entry