CVE-2013-1740

What it is

The ssl_Do1stHandshake function in sslsecur.c in libssl in Mozilla Network Security Services (NSS) before 3.15.4, when the TLS False Start feature is enabled, allows man-in-the-middle attackers to spoof SSL servers by using an arbitrary X.509 certificate during certain handshake traffic.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2014-01-18 22:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:52 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 5.8 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2014-01-18 22:55 UTC

Last modified

2026-06-16 23:52 UTC

Exploit probability

1.7% · EPSS, next 30 days

Weakness

CWE-310

Record status

Modified

Affected

• Mozilla Network Security Services ≤ 3.15.3
• Mozilla Network Security Services 3.2
• Mozilla Network Security Services 3.2.1
• Mozilla Network Security Services 3.3
• Mozilla Network Security Services 3.3.1
• Mozilla Network Security Services 3.3.2
• Mozilla Network Security Services 3.4
• Mozilla Network Security Services 3.4.1

Attack profile CVSS 2.0 · 5.8

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

Is it in your code?

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