Medium severity · published Mar 4, 2026
CVE-2026-20005
Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine…
5.8
CVSS
0.5%
EPSS
No
On KEV
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 Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete parsing of the SSL handshake ingress packets. An attacker could exploit this vulnerability by sending crafted SSL handshake packets. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine restarts unexpectedly.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Cisco Cyber Vision · Cisco
3.0.4; 3.0.0; 3.0.1; 3.0.2; 3.0.3; 3.0.5; +34 more · source: vendor
CS
Cisco Secure Firewall Threat Defense (FTD) Software · Cisco
7.6.0; 7.6.1; 7.6.2; 7.6.2.1; 7.7.0; 7.7.10; +1 more · source: vendor
CU
Cisco UTD SNORT IPS Engine Software · Cisco
17.2.1r; 17.3.1a; 17.3.2; 17.3.3; 17.3.4a; 17.3.6; +34 more · source: vendor
CV
Cyber Vision · Cisco
3.0.0; 3.0.1; 3.0.2; 3.0.3; 3.0.4; 3.0.5; +34 more · source: NVD
SF
Secure Firewall Threat Defense · Cisco
7.6.0; 7.6.1; 7.6.2; 7.6.2.1; 7.7.0; 7.7.10; +1 more · source: NVD
SN
Snort · Cisco
3.0.0-233 before 3.9.2.0 · source: NVD
UT
Unified Threat Defense Snort Intrusion Prevention System Engine · Cisco
17.9.4; 17.9.5e; 17.12.1a; 17.12.2; 17.12.3; 17.12.3a; +23 more · source: NVD
Affected product
CC
Cisco Cyber Vision
Cisco
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