CVE-2026-76445
Multiple Cisco Products Snort 3 Denial of Service Vulnerability
CVE-2026-76445: Multiple Cisco Products Snort 3 Denial of Service Vulnerability. Not in the CISA KEV catalog. Medium advisory severity (CVSS 5.3, Cisco).
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
CVE-2026-76445 at a glance
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- Medium
- CVSS base score
- 5.3 (Cisco)
- Fixed releases
- Cisco: 3.12.4.0, 17.12.8, 17.15.6, 17.18.5, 26.1.2, 26.2.1
- Vendor advisories
- 2 from Cisco
- VulniPulse record
- Published · Updated
Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-76445; bulletin-wide values are not repeated here.
Is CVE-2026-76445 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-76445 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-76445?
Upgrade to a fixed release named by the vendor:
- Cisco: 3.12.4.0, 17.12.8, 17.15.6, 17.18.5, 26.1.2, 26.2.1
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory. (Cisco)
- Release 3.x: upgrade to 3.12.4.0. (Cisco)
Vendor advisory comparison
Cisco
2 advisories- Advisory severityMedium5.3
Medium [CVE-2026-76445] Multiple Cisco Products Snort 3 Denial of Service Vulnerability
cisco-sa-snort3-gtpcodec-dos-RmecfepzSource published Source updated
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. Cisco has released software updates that address this vulnerability. There…
- Affected products in this advisory
- Secure Firewall Threat Defense (FTD) Software
- Firepower 2100 Series
- Firepower 1000 Series
- ASA 5500-X Series Firewalls
4 more entries in the full advisory.
- Source-reported affected versions
- Release 3.x (first fixed: 3.12.4.0)
- Release 17.12 (first fixed: 17.12.8)
- Release 17.15 (first fixed: 17.15.6)
- Release 17.18 (first fixed: 17.18.5)
2 more entries in the full advisory.
- Source-reported fixed versions
- 3.12.4.0
- 17.12.8
- 17.15.6
- 17.18.5
2 more entries in the full advisory.
- Mitigation guidance
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Release 3.x: upgrade to 3.12.4.0.
- Release 17.12: upgrade to 17.12.8.
- Release 17.15: upgrade to 17.15.6.
3 more entries in the full advisory.
- Workarounds
- There are no workarounds that address this vulnerability.
- Advisory severityUnrated
Advisory [CVE-2026-20011 +12] Cisco Advance Notification for Publication of October 21, 2026, Security Advisories
cisco-sa-notice-QGwHnJ6kSource published Source updated
This bulletin covers 13 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
On October 21, 2026, the Cisco Product Security Incident Response Team (PSIRT) published the following advisories. To remediate the vulnerabilities that were disclosed on October 21, 2026, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the Foundation: A Predictable, Customer-Focused Response to AI-Accelerated Vulnerability Discovery. Snort 3 Cisco Security Advisory CVE ID Security Impact Rating CVSS Base Score Critical 9.0 High 7.8 Medium 5.8 5.3 Cisco Expressway and Unified Communications Products
- Affected products in this advisory
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- To remediate the vulnerabilities that were disclosed on October 21, 2026, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories.
Browse the latest tracked CVEs or the CVEs listed in CISA KEV.
Android app · Google Play
Monitor future Cisco CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.