CVE-2014-3556

mediumpriority · track · 30EPSS 0.078 · 95 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

7.83% (95th) EPSS

CVSS 6.8 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

The STARTTLS implementation in mail/ngx_mail_smtp_handler.c in the SMTP proxy in nginx 1.5.x and 1.6.x before 1.6.1 and 1.7.x before 1.7.4 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.

cvss

Technical severity, 0–10. One row per scoring source.

6.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nsecondary · FSTEC (BDU) RU

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-77USprimaryCWE-77US

affected products (5)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
NGINX Inc. nginx1.5.6 → 1.6.1fstec_bduRU
NGINX Inc. nginx1.7.0 → 1.7.4fstec_bduRU
f5 nginx1.5.6 → 1.6.1nvdUScpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*
f5 nginx1.7.0 → 1.7.4nvdUScpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2014-12-29modified 2026-06-17

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+4594 more

references (13)

External citations — patches, advisories, analysis.

scry

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