GCVE-110-NCSC-2026-450

Advisory PublishedCVSS 5.3/10

Vulnetix · Advisory published October 22, 2026

A vulnerability in the Snort 3 SMTP MIME Decoder in multiple Cisco products allows an unauthenticated remote attacker to cause the Snort 3 Detection Engine to restart due to insufficient error checking in MIME field parsing, resulting in denial of service.

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Weaknesses (CWE)

CWE-805Buffer Access with Incorrect Length ValueCWE-835Loop with Unreachable Exit Condition ('Infinite Loop')CWE-787Out-of-bounds WriteCWE-128Wrap-around ErrorCWE-121Stack-based Buffer OverflowCWE-476NULL Pointer DereferenceCWE-401Missing Release of Memory after Effective LifetimeCWE-306Missing Authentication for Critical Function

Risk Scores

CVSS 3.1

5.3/10

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

Affected Products

Vendor	Product	Versions	Platforms
Cisco	vers:unknown/*	—	—

Aliases

CVE-2026-20011 CVE-2026-20019 CVE-2026-20043 CVE-2026-20179 CVE-2026-20197 CVE-2026-20218 CVE-2026-20221 CVE-2026-20236 CVE-2026-20291 CVE-2026-20356 CVE-2026-76445 CVE-2026-76489 CVE-2026-76524

References

advisory

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