CVE-2013-5546

What it is

The TCP reassembly feature in Cisco IOS XE 3.7 before 3.7.3S and 3.8 before 3.8.1S on 1000 ASR devices allows remote attackers to cause a denial of service (device reload) via large TCP packets that are processed by the (1) NAT or (2) ALG component, aka Bug ID CSCud72509.

At a glance

Exploitability

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

Exploit odds

1.9% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2013-10-31 21:55 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: 1.9% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2013-10-31 21:55 UTC

Last modified

2026-06-16 23:58 UTC

Exploit probability

1.9% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco iOS Xe 3.7.0s
• Cisco iOS Xe 3.7.1s
• Cisco iOS Xe 3.7.2s
• Cisco iOS Xe 3.8.0s
• Cisco Asr 1001
• Cisco Asr 1002
• Cisco Asr 1002-x
• Cisco Asr 1004

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

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