Skip to main content
Threat Radar animated logo

CVE-2026-76445: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Open Source Snort3

0
Medium
VulnerabilityCVE-2026-76445cvecve-2026-76445
Published: 10/21/2026 (10/21/2026, 16:14:39 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Open Source Snort3

Description

Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the detection engine to unexpectedly restart, resulting in a denial of service (DoS) condition. The vulnerability is due to a flaw in logic handling when General Packet Radio Service (GPRS) Tunneling Protocol (GTP) extension headers are processed within the codec. An attacker could exploit this vulnerability by sending a crafted, fragmented UDP datagram that contains these headers to the Snort 3 Detection Engine of an affected device. A successful exploit could allow the attacker to cause the detection engine to enter an infinite loop, resulting in a DoS condition.

CVSS v3.1

Score 5.3medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected software

Cisco

Cisco Open Source Snort3

Affected versions
=3.12.2.0=3.1.2.0=3.1.3.0=3.1.4.0=3.1.5.0=3.1.6.0=3.1.7.0=3.1.8.0=3.1.9.0=3.1.10.0=3.1.12.0=3.1.13.0=3.1.14.0=3.1.15.0=3.1.16.0=3.1.17.0=3.1.18.0=3.1.19.0=3.1.20.0=3.1.21.0=3.1.22.0=3.1.23.0=3.1.24.0=3.1.25.0=3.1.27.0=3.1.28.0=3.1.29.0=3.1.30.0=3.1.31.0=3.1.32.0=3.1.36.0=3.1.38.0=3.1.39.0=3.1.40.0=3.1.41.0=3.1.42.0=3.1.43.0=3.1.45.0=3.1.47.0=3.1.48.0=3.1.50.0=3.1.51.0=3.1.52.0=3.1.53.0=3.1.55.0=3.1.56.0=3.1.57.0=3.1.58.0=3.1.59.0=3.1.60.0=3.1.61.0=3.1.62.0=3.1.63.0=3.1.64.0=3.1.65.0=3.1.66.0=3.1.67.0=3.1.69.0=3.1.70.0=3.1.71.0=3.1.72.0=3.1.73.0=3.1.74.0=3.1.75.0=3.1.76.0=3.1.77.0=3.1.78.0=3.1.81.0=3.1.82.0=3.1.83.0=3.1.84.0=3.2.1.0=3.2.2.0=3.3.0.0=3.3.1.0=3.3.2.0=3.3.3.0=3.3.4.0=3.3.5.0=3.3.7.0=3.5.0.0=3.5.1.0=3.8.1.0=3.6.0.0=3.6.2.0=3.9.3.0=3.7.2.0=3.7.0.0=3.9.6.0=3.10.0.0=3.10.2.0=3.7.4.0=3.9.0.0=3.5.2.0=3.12.1.0=3.6.1.0=3.9.2.0=3.6.3.0=3.9.5.0=3.7.1.0=3.9.7.0=3.7.3.0=3.10.1.0=3.9.1.0=3.11.1.0

Cisco

Cisco Secure Firewall Threat Defense (FTD) Software

Affected versions
=7.0.0=7.0.0.1=7.0.1=7.0.1.1=7.0.2=7.2.0=7.0.2.1=7.0.3=7.2.0.1=7.0.4=7.2.1=7.0.5=7.3.0=7.2.2=7.2.3=7.3.1=7.2.4=7.0.6=7.2.5=7.2.4.1=7.3.1.1=7.4.0=7.0.6.1=7.2.5.1=7.4.1=7.2.6=7.0.6.2=7.4.1.1=7.2.7=7.2.5.2=7.3.1.2=7.2.8=7.6.0=7.4.2=7.2.8.1=7.0.6.3=7.4.2.1=7.2.9=7.0.7=7.7.0=7.4.2.2=7.2.10=7.6.1=7.4.2.3=7.0.8=7.6.2=7.7.10=7.7.11=7.0.8.1=7.6.2.1=7.7.10.1=7.4.2.4=7.2.10.2=7.4.3=7.6.4=10.0.0=7.4.4=7.0.9=7.2.11=7.4.7

Cisco

Cisco UTD SNORT IPS Engine Software

Affected versions
=17.12.1a=17.12.2=17.12.3=17.12.4=17.12.3a=17.15.1a=17.12.4a=17.15.2c=17.12.4b=17.15.2a=17.12.5=17.12.5a=17.15.3a=17.15.3=17.12.5b=17.12.5c=17.15.4=17.18.1=17.18.1a=17.12.6=17.15.4c=17.12.5d=17.18.2=17.15.5=17.15.5a=17.12.7=17.12.7a=17.12.7b=17.18.3a=17.12.8=17.15.6=17.18.4

Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2026-08-19T12:02:03.635Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6ad8e8d44d27ba8daac3b6bf

Added to database: 10/21/2026, 16:31:16 UTC

Last updated: 10/21/2026, 23:45:42 UTC

Views: 7

Community Reviews

0 reviews

Crowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.

Sort by
Loading community insights…

Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.

Actions

Please log in to the Console to use AI analysis features.

Need more coverage?

Upgrade to Pro Console for AI refresh and higher limits.

For incident response and remediation, OffSeq services can help resolve threats faster.

Latest Threats

Breach by OffSeqOFFSEQFRIENDS — 25% OFF

Check if your credentials are on the dark web

Instant breach scanning across billions of leaked records. Free tier available.

Scan now
OffSeq TrainingCredly Certified

Lead Pen Test Professional

Technical5-day eLearningPECB Accredited
View courses