CVE-2013-5549

What it is

Cisco IOS XR 3.8.1 through 4.2.0 does not properly process fragmented packets within the RP-A, RP-B, PRP, and DRP-B route-processor components, which allows remote attackers to cause a denial of service (transmission outage) via (1) IPv4 or (2) IPv6 traffic, aka Bug ID CSCuh30380.

At a glance

Exploitability

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

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2013-10-25 03:52 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:58 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 7.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2013-10-25 03:52 UTC

Last modified

2026-06-16 23:58 UTC

Exploit probability

1.7% · EPSS, next 30 days

Record status

Modified

Affected

• Cisco iOS Xr 3.8.1
• Cisco iOS Xr 3.8.2
• Cisco iOS Xr 3.8.3
• Cisco iOS Xr 3.8.4
• Cisco iOS Xr 3.9.0
• Cisco iOS Xr 3.9.1
• Cisco iOS Xr 3.9.2
• Cisco iOS Xr 4.0.0

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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