CVE-2011-4231

What it is

Cisco IOS 15.1 and 15.2 and IOS XE 3.x, when configured as an IPsec hub with X.509 certificates in use, allows remote authenticated users to cause a denial of service (segmentation fault and device crash) via unspecified vectors, aka Bug ID CSCtq61128.

At a glance

Exploitability

Can be exploited over the network with a login. High risk of service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2012-05-03 10:11 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:34 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.6% in the next 30 days (EPSS).
• Severity: 6.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2012-05-03 10:11 UTC

Last modified

2026-06-16 23:34 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco iOS 15.1
• Cisco iOS 15.2
• Cisco iOS Xe 3.1.0s
• Cisco iOS Xe 3.1.0sg
• Cisco iOS Xe 3.1.1s
• Cisco iOS Xe 3.1.1sg
• Cisco iOS Xe 3.1.2s
• Cisco iOS Xe 3.1.3s

Attack profile CVSS 2.0 · 6.3

Attack vector

Network

Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

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.

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