Vulnerability feed

CVE and vendor PSIRT advisories from 13 sources, last 30 days. Updated hourly, last run Oct 26 02:05 UTC

Critical in the last 24 hours

1603 in 30 days

Newly known exploited

In the last 24 hours, CISA KEV and vendor reports

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Every hour, see the list

New in the last 24 hours

144-76% vs 7-day avg of 597

2 critical, 38 high, 59 medium, 25 low

Expand	Severity	Score	Advisory	Title	Source	Published
	High	7.5	CVE-2026-20356	As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... CiscoCisco Open Source Snort3, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco UTD SNORT IPS Engine Software, Cisco Cyber Vision	NVD	Oct 21 17:18 UTC
CVE-2026-20356As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... From the advisory As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20356 are related to issues concerning uncontrolled resource consumption that are grouped under the Common Weakness Enumeration (CWE) Base CWE-400. Impact if exploited ConfidentialityNone IntegrityNone AvailabilityHigh How it is exploited Attack vector Network Attack complexity Low Privileges required None User interaction None Scope Unchanged CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affects Cisco Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (FTD) Software Cisco UTD SNORT IPS Engine Software Cisco Cyber Vision NIST National Vulnerability DatabasePublished Oct 21, 2026 17:18 UTC Read the advisory
	High	7.8	CVE-2026-20291	As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... CiscoCisco Open Source Snort3, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco UTD SNORT IPS Engine Software, Cisco Cyber Vision	NVD	Oct 21 17:18 UTC
CVE-2026-20291As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... From the advisory As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20291 are related to issues concerning improper privilege management that are grouped under the Common Weakness Enumeration (CWE) Base CWE-269. Impact if exploited ConfidentialityHigh IntegrityHigh AvailabilityHigh How it is exploited Attack vector Local Attack complexity Low Privileges required Low User interaction None Scope Unchanged CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Affects Cisco Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (FTD) Software Cisco UTD SNORT IPS Engine Software Cisco Cyber Vision NIST National Vulnerability DatabasePublished Oct 21, 2026 17:18 UTC Read the advisory
	High	7.5	CVE-2026-20236	As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... CiscoCisco Open Source Snort3, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco UTD SNORT IPS Engine Software, Cisco Cyber Vision	NVD	Oct 21 17:18 UTC
CVE-2026-20236As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... From the advisory As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20236 are related to issues concerning incorrect calculation that are grouped under the Common Weakness Enumeration (CWE) Base CWE-682. Impact if exploited ConfidentialityNone IntegrityNone AvailabilityHigh How it is exploited Attack vector Network Attack complexity Low Privileges required None User interaction None Scope Unchanged CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affects Cisco Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (FTD) Software Cisco UTD SNORT IPS Engine Software Cisco Cyber Vision NIST National Vulnerability DatabasePublished Oct 21, 2026 17:18 UTC Read the advisory
	Medium	5.8	CVE-2026-20221	Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow... CiscoCisco Open Source Snort3, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco UTD SNORT IPS Engine Software, Cisco Cyber Vision, Cisco Umbrella Insights Virtual Appliance	NVD	Oct 21 17:18 UTC
CVE-2026-20221Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow... From the advisory Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine. This vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required. Impact if exploited ConfidentialityNone IntegrityNone AvailabilityLow How it is exploited Attack vector Network Attack complexity Low Privileges required None User interaction None Scope Changed CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L Affects Cisco Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (FTD) Software Cisco UTD SNORT IPS Engine Software Cisco Cyber Vision Cisco Umbrella Insights Virtual Appliance NIST National Vulnerability DatabasePublished Oct 21, 2026 17:18 UTC Read the advisory
	Critical	9.0	CVE-2026-20043	As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... CiscoCisco Open Source Snort3, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco UTD SNORT IPS Engine Software, Cisco Cyber Vision	NVD	Oct 21 17:18 UTC
CVE-2026-20043As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive... From the advisory As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787. Impact if exploited ConfidentialityHigh IntegrityHigh AvailabilityHigh How it is exploited Attack vector Network Attack complexity High Privileges required None User interaction None Scope Changed CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Affects Cisco Cisco Open Source Snort3 Cisco Secure Firewall Threat Defense (FTD) Software Cisco UTD SNORT IPS Engine Software Cisco Cyber Vision NIST National Vulnerability DatabasePublished Oct 21, 2026 17:18 UTC Read the advisory

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