CVE-2015-1791

What it is

Race condition in the ssl3_get_new_session_ticket function in ssl/s3_clnt.c in OpenSSL before 0.9.8zg, 1.0.0 before 1.0.0s, 1.0.1 before 1.0.1n, and 1.0.2 before 1.0.2b, when used for a multi-threaded client, allows remote attackers to cause a denial of service (double free and application crash) or possibly have unspecified other impact by providing a NewSessionTicket during an attempt to reuse a ticket that had been obtained earlier.

At a glance

Exploitability

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

Exploit odds

16.7% 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. 2015-06-12 19:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:23 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 16.7% in the next 30 days (EPSS).
• Severity: 6.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2015-06-12 19:59 UTC

Last modified

2026-06-17 00:23 UTC

Exploit probability

16.7% · EPSS, next 30 days

Weakness

CWE-362 · Race condition

Record status

Modified

Affected

• OpenSSL ≤ 0.9.8zf
• 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

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-2015-1791.md and follow it. Check whether this project is affected by CVE-2015-1791. 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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