CVE-2008-4543

What it is

Cisco Unity 4.x before 4.2(1)ES161, 5.x before 5.0(1)ES53, and 7.x before 7.0(2)ES8, when using anonymous authentication (aka native Unity authentication), allows remote attackers to cause a denial of service (session exhaustion) via a large number of connections.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.8% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2008-10-13 20:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 22:58 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.8% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2008-10-13 20:00 UTC

Last modified

2026-06-16 22:58 UTC

Exploit probability

1.8% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco Unity ≤ 4.2\(1\)
• Cisco Unity ≤ 5.0\(1\)
• Cisco Unity ≤ 7.0\(2\)
• Cisco Unity 4.0
• Cisco Unity 4.0\(1\)
• Cisco Unity 4.0\(2\)
• Cisco Unity 4.0\(3\)
• Cisco Unity 4.0\(4\)

Attack profile CVSS 2.0 · 7.1

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

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