CVE-2014-3509

What it is

Race condition in the ssl_parse_serverhello_tlsext function in t1_lib.c in OpenSSL 1.0.0 before 1.0.0n and 1.0.1 before 1.0.1i, when multithreading and session resumption are used, allows remote SSL servers to cause a denial of service (memory overwrite and client application crash) or possibly have unspecified other impact by sending Elliptic Curve (EC) Supported Point Formats Extension data.

At a glance

Exploitability

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

Exploit odds

12.9% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2014-08-13 23:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:08 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 12.9% in the next 30 days (EPSS).
• Severity: 6.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2014-08-13 23:55 UTC

Last modified

2026-06-17 00:08 UTC

Exploit probability

12.9% · EPSS, next 30 days

Weakness

CWE-362 · Race condition

Record status

Modified

Affected

• OpenSSL 1.0.0
• OpenSSL 1.0.0a
• OpenSSL 1.0.0b
• OpenSSL 1.0.0c
• OpenSSL 1.0.0d
• OpenSSL 1.0.0e
• OpenSSL 1.0.0f
• OpenSSL 1.0.0g

Attack profile CVSS 2.0 · 6.8

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2014-3509.md and follow it. Check whether this project is affected by CVE-2014-3509. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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