CVE-2009-2049

5.4 MEDIUM 2% exploit odds Fix listed

What it is

Cisco IOS 12.0(32)S12 through 12.0(32)S13 and 12.0(33)S3 through 12.0(33)S4, 12.0(32)SY8 through 12.0(32)SY9, 12.2(33)SXI1 through 12.2(33)SXI2, 12.2XNC before 12.2(33)XNC2, 12.2XND before 12.2(33)XND1, and 12.4(24)T1; and IOS XE 2.3 through 2.3.1t and 2.4 through 2.4.0; when RFC4893 BGP routing is enabled, allows remote attackers to cause a denial of service (device reload) by using an RFC4271 peer to send a malformed update, aka Bug ID CSCta33973.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 2.4% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-07-30 18:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:08 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.4% in the next 30 days (EPSS).
Severity: 5.4 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-07-30 18:30 UTC
Last modified: 2026-06-16 23:08 UTC
Exploit probability: 2.4% · EPSS, next 30 days
Weakness: CWE-16
Record status: Modified

Affected

Cisco iOS 12.0\(32\)s12
Cisco iOS 12.0\(32\)s13
Cisco iOS 12.0\(32\)sy8
Cisco iOS 12.0\(32\)sy9
Cisco iOS 12.0\(33\)s3
Cisco iOS 12.0\(33\)s4
Cisco iOS 12.2\(33\)sxi1
Cisco iOS 12.2\(33\)sxi2

Attack profile CVSS 2.0 · 5.4

Attack vector: Network
Complexity: High
Authentication: None
Confidentiality: None
Integrity: None
Availability: Complete

Raw vector

AV:N/AC:H/Au:N/C:N/I:N/A:C

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-2009-2049.md and follow it. Check whether this project is affected by CVE-2009-2049. 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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Fix and advisories

References

NVD record · CVE.org record