Strix
26.1K

CVE-2026-20005

MEDIUMCVSS 5.8/10EPSS 0.49%

Last modified

CVE-2026-20005 is a medium-severity vulnerability rated 5.8/10 on the CVSS scale. 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. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

EPSS Probability
0.49%

38.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
CiscoCisco Secure Firewall Threat Defense (FTD) Software7.6.0; 7.6.1; 7.6.2; 7.6.2.1; 7.7.0; 7.7.10; 7.7.10.1
CiscoCisco Cyber Vision3.0.4; 3.0.0; 3.0.1; 3.0.2; 3.0.3; 3.0.5; 3.0.6; 3.1.0; 3.1.2; 3.1.1; 3.2.3; 3.2.1; 3.2.4; 3.2.0; 3.2.2; 4.0.0; 4.0.1; 4.0.2; 4.0.3; 4.1.0; 4.1.1; 4.1.2; 4.1.3; 4.1.4; 4.1.5; 4.1.6; 4.1.7; 4.2.0; 4.2.1; 4.2.4; 4.2.6; 4.2.2; 4.2.3; 4.3.0; 4.3.1; 4.3.2; 4.3.3; 4.4.0; 4.4.1; 4.4.2; 4.4.3; 5.0.0; 5.0.1; 5.0.2; 5.1.1; 5.1.2; 5.1.3; 5.2.0; 5.2.1; 5.3.0; 5.3.1; 5.3.2
CiscoCisco UTD SNORT IPS Engine Software17.2.1r; 17.3.1a; 17.3.2; 17.3.3; 17.3.4a; 17.3.6; 17.3.5; 17.3.7; 17.3.8; 17.4.1a; 17.4.2; 17.4.1b; 17.5.1a; 17.6.1a; 17.6.2; 17.6.3a; 17.6.4; 17.6.5; 17.6.6; 17.6.7; 17.6.8a; 17.7.1a; 17.7.2; 17.10.1a; 17.9.1a; 17.9.2a; 17.9.3a; 17.9.4; 17.9.5a; 17.9.6; 17.9.5e; 17.9.5f; 17.9.7a; 17.9.8; 17.9.7b; 17.8.1a; 17.11.1a; 17.12.1a; 17.12.2; 17.12.3; 17.12.4; 17.12.4a; 17.12.4b; 17.12.5; 17.12.5a; 17.12.5b; 17.12.5c; 17.12.6; 17.12.5d; 17.13.1a; 17.14.1a; 17.15.1a; 17.15.2a; 17.15.2c; 17.15.3; 17.15.3a; 17.15.4; 17.15.4c; 17.16.1a; 17.17.1; 17.18.1a; 17.18.2

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is 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 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.
How severe is CVE-2026-20005?
CVE-2026-20005 has a CVSS score of 5.8/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20005?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-20005?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST