CVE-2026-20043 Cisco Snort 3 - Out of Bounds Write

Cisco Snort 3 contains an out-of-bounds write vulnerability caused by improper bounds checking, letting attackers potentially corrupt memory or cause denial of service, exploit requires crafted input.

CVSS base score 9.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Out of Bounds Write
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest Snort 3 version with security hardening fixes.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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