CVE-2017-12311

What it is

A vulnerability in the H.264 decoder function of Cisco Meeting Server could allow an unauthenticated, remote attacker to cause a Cisco Meeting Server media process to restart unexpectedly when it receives an illegal H.264 frame. The vulnerability is triggered by an H.264 frame that has an invalid picture parameter set (PPS) value. An attacker could exploit this vulnerability by sending a malformed H.264 frame to the targeted device. An exploit could allow the attacker to cause a denial of service (DoS) condition because the media process could restart. The media session should be re-established within a few seconds, during which there could be a brief interruption in service. Cisco Bug IDs: CSCvg12559.

At a glance

Exploitability

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

Exploit odds

2.2% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2017-11-16 07:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:03 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.2% in the next 30 days (EPSS).
• Severity: 5.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-11-16 07:29 UTC

Last modified

2026-06-17 01:03 UTC

Exploit probability

2.2% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco Meeting Server 2.0
• Cisco Meeting Server 2.1.0
• Cisco Meeting Server 2.2.0
• Cisco Meeting Server 2.3.0

Attack profile CVSS 3.0 · 5.8

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

Low

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-2017-12311.md and follow it. Check whether this project is affected by CVE-2017-12311. 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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