CVE-2026-20052
published 2026-03-04CVE-2026-20052: A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an…
PriorityP433medium5.8CVSS 3.1
AVNACLPRNUINSCCNINAL
EPSS
0.41%
34.2th percentile
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.
This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | cisco_secure_firewall_threat_defense_software | — | — |
| cisco | secure_firewall_threat_defense | — | — |
| cisco | secure_firewall_threat_defense | — | — |
| cisco | secure_firewall_threat_defense | — | — |
| cisco | secure_firewall_threat_defense | — | — |
| cisco | secure_firewall_threat_defense | — | — |
| cisco | secure_firewall_threat_defense | — | — |
| cisco | secure_firewall_threat_defense | — | — |
CVSS provenance
nvdv3.15.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
vendor_cisco5.8MEDIUM
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Cisco
Cisco Secure Firewall Threat Defense Software Snort 3 SSL Memory Management Denial of Service Vulnerability
vendor_cisco·2026-03-04·CVSS 5.8
CVE-2026-20052 [MEDIUM] CWE-788 Cisco Secure Firewall Threat Defense Software Snort 3 SSL Memory Management Denial of Service Vulnerability
Cisco Secure Firewall Threat Defense Software Snort 3 SSL Memory Management Denial of Service Vulnerability
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.
This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.
Cisco has released softwar
Cisco
Cisco Secure Firewall Threat Defense Software Snort 3 SSL Memory Management Denial of Service Vulnerability
vendor_cisco·CVSS 3.1
CVE-2026-20052 Cisco Secure Firewall Threat Defense Software Snort 3 SSL Memory Management Denial of Service Vulnerability
CVE-2026-20052: Cisco Secure Firewall Threat Defense Software Snort 3 SSL Memory Management Denial of Service Vulnerability
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts. Cisco has rel
VulDB
Cisco Secure Firewall Threat Defense Software up to 7.6.0 Snort 3 SSL Memory Management access of memory location after end of buffer (cisco-sa-ftd-snort3ssl-FBEKYXpH)
vuldb·2026-08-22·CVSS 5.8
CVE-2026-20052 [MEDIUM] Cisco Secure Firewall Threat Defense Software up to 7.6.0 Snort 3 SSL Memory Management access of memory location after end of buffer (cisco-sa-ftd-snort3ssl-FBEKYXpH)
A vulnerability, which was classified as problematic, has been found in Cisco Secure Firewall Threat Defense Software up to 7.6.0. Affected by this issue is some unknown functionality of the component Snort 3 SSL Memory Management. This manipulation causes access of memory location after end of buffer.
This vulnerability is handled as CVE-2026-20052. The attack can be initiated remotely. There is not any exploit available.
It is advisable to upgrade the affected component.
GHSA
GHSA-f3x2-jxv4-r583: A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow
ghsa_unreviewed·2026-03-04
CVE-2026-20052 [MEDIUM] CWE-788 GHSA-f3x2-jxv4-r583: A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow
A vulnerability in the memory management handling for the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.
This vulnerability is due to a logic error in memory management when a device is performing Snort 3 SSL packet inspection. An attacker could exploit this vulnerability by sending crafted SSL packets through an established connection to be parsed by the Snort 3 Detection Engine. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-03-04
Published