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9.3

Cisco IOS 12.0-12.4 can crash from bad SIP packet

CVE-2007-4292 · published 19 years ago
Summary

Versions of Cisco IOS from 12.0 through 12.4 can run out of memory when they receive a specially crafted SIP (VoIP) packet, causing the device to stop working. This could let an outsider make the router or switch unavailable, disrupting network services. Update the IOS software to a version that includes the fix or apply any recommended configuration changes from Cisco.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco ios 12.0
12.1
12.2
12.3
12.4
cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*
Original advisory text
Multiple memory leaks in Cisco IOS 12.0 through 12.4 allow remote attackers to cause a denial of service (device crash) via a malformed SIP packet, aka (1) CSCsf11855, (2) CSCeb21064, (3) CSCse4027...
Multiple memory leaks in Cisco IOS 12.0 through 12.4 allow remote attackers to cause a denial of service (device crash) via a malformed SIP packet, aka (1) CSCsf11855, (2) CSCeb21064, (3) CSCse40276, (4) CSCse68355, (5) CSCsf30058, (6) CSCsb24007, and (7) CSCsc60249.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
9.3 Critical
Exploitation
3% chance of attack within 30 days
Timeline
Published9 Aug 2007
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2007-4292 · NVD
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